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GAF Officer Cadet Exam study materials
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GAF Officer Cadet Exam practice questions

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Question 1Integrated english, quant, formal, professional, ghana foundations

On which date did Ghana gain independence from British colonial rule?

  1. 6th March 1957 Correct answer.
  2. 1st July 1960
  3. 28th February 1948
  4. 4th June 1979

Explanation

Ghana gained independence on 6th March 1957 under the leadership of Dr. Kwame Nkrumah, becoming the first sub-Saharan African nation to achieve independence from European colonial rule.

Question 2Integrated english, quant, formal, professional, ghana foundations

Who was the leader of the Gold Coast nationalist movement and the first Prime Minister and President of Ghana?

  1. Dr. J.B. Danquah
  2. Dr. Kwame Nkrumah Correct answer.
  3. Dr. Kofi Abrefa Busia
  4. Edward Akufo-Addo

Explanation

Dr. Kwame Nkrumah led the Convention People's Party (CPP) to achieve independence and served as Ghana's first Prime Minister (from 1957) and first President (from 1960) until he was overthrown in 1966.

Question 3Integrated english, quant, formal, professional, ghana foundations

Which country shares Ghana's northern border?

  1. Burkina Faso Correct answer.
  2. Togo
  3. Ivory Coast
  4. Mali

Explanation

Ghana is bordered by Burkina Faso to the north, Togo to the east, and Ivory Coast (Côte d'Ivoire) to the west.

Question 4Integrated english, quant, formal, professional, ghana foundations

What is the capital city of the Northern Region of Ghana?

  1. Tamale Correct answer.
  2. Kumasi
  3. Takoradi
  4. Bolgatanga

Explanation

Tamale is the capital of the Northern Region and is the third-largest city in Ghana.

Question 5Integrated english, quant, formal, professional, ghana foundations

Which major river in Ghana is the primary source of hydroelectric power generated at the Akosombo and Kpong dams?

  1. The Volta River Correct answer.
  2. The Pra River
  3. The Ankobra River
  4. The Densu River

Explanation

The Volta River, formed by the confluence of the Black Volta, White Volta, and Red Volta, is dammed at Akosombo to generate the majority of Ghana's domestic electricity.

Question 6Integrated english, quant, formal, professional, ghana foundations

Which Ghanaian diplomat served as the seventh Secretary-General of the United Nations from 1997 to 2006, receiving the Nobel Peace Prize?

  1. Kofi Annan Correct answer.
  2. Alex Quaison-Sackey
  3. Dr. Mohamed Ibn Chambas
  4. Akua Kuenyehia

Explanation

Kofi Annan was a prominent Ghanaian diplomat who served as the UN Secretary-General for two terms and was co-awarded the Nobel Peace Prize in 2001.

Question 7Integrated english, quant, formal, professional, ghana foundations

Based on the passage, why has the officer cadet curriculum changed?

  1. Because traditional physical training is no longer considered necessary for officer cadets.
  2. Because contemporary conflicts are non-linear and span multiple modern domains like cyber and information warfare. Correct answer.
  3. Because international bodies have mandated the inclusion of humanitarian law in all academies.
  4. Because digital literacy has completely replaced physical warfare in West Africa.

Explanation

The passage states that conflicts are rarely linear and span across cyber, informational, and asymmetric domains, prompting training facilities to incorporate strategic communication and digital literacy into their curricula.

Question 8Integrated english, quant, formal, professional, ghana foundations

According to the passage, what is the primary goal of modern military training for officer cadets?

  1. To ensure cadets can pass rigorous cyber security certifications before commissioning.
  2. To prepare leaders to make ethical decisions under psychological pressure in fluid situations. Correct answer.
  3. To phase out conventional warfare tactics in favor of digital diplomacy.
  4. To prioritize theoretical strategic research over tactical battlefield execution.

Explanation

The text explicitly states: 'The goal is to groom leaders who can make sound ethical decisions under intense psychological pressure, balancing the rules of engagement with the fluid realities on the ground.'

Question 9Integrated english, quant, formal, professional, ghana foundations

What is the meaning of the word 'asymmetric' as used in the passage?

  1. Referring to military operations that are perfectly balanced between two equal nations.
  2. Denoting warfare where the resources and tactics of the opposing forces differ significantly. Correct answer.
  3. Describing physical fitness exercises that focus on one side of the body.
  4. Indicating conflicts that are resolved purely through international trade sanctions.

Explanation

In a military context, asymmetric warfare refers to unconventional tactics used by opposing forces with unequal power, resources, or strategies, rather than standard state-vs-state linear battles.

Question 10Integrated english, quant, formal, professional, ghana foundations

Which of the following statements is best supported by the passage?

  1. Physical strength is now secondary to mental intellect in the Ghana Armed Forces.
  2. The curriculum at the Ghana Military Academy has remained unchanged for decades to preserve tradition.
  3. Modern military officers require a combination of physical endurance and advanced cognitive skills. Correct answer.
  4. International law is the only field that guides ethical decision-making for modern commanders.

Explanation

The passage notes that physical resilience is required and concludes that 'analytical skills are as critical as physical prowess,' indicating both are essential for modern officers.

Question 11Integrated english, quant, formal, professional, ghana foundations

What is the author's tone in the passage?

  1. Highly critical and dismissive of traditional military tactics.
  2. Informative and analytical, emphasizing adaptation in officer education. Correct answer.
  3. Alarmist, warning of imminent cyber warfare threats to West Africa.
  4. Nostalgic, mourning the loss of simple combat methods of the past.

Explanation

The author uses a objective, informative, and analytical tone to explain why military curricula are changing in response to evolving, non-linear conflict environments.

Question 12Integrated english, quant, formal, professional, ghana foundations

Choose the word that is most nearly SYNONYMOUS with 'RECONNAISSANCE'.

  1. Retaliation
  2. Surveillance Correct answer.
  3. Neutralization
  4. Ambuscade

Explanation

Reconnaissance is a military term referring to the preliminary observation of a region to gather information about enemy forces or positions, which is synonymous with surveillance.

Question 13Integrated english, quant, formal, professional, ghana foundations

Identify the word that is most nearly OPPOSITE in meaning to 'MANDATORY'.

  1. Obligatory
  2. Compulsory
  3. Discretionary Correct answer.
  4. Involuntary

Explanation

'Mandatory' means required by law or rules. The opposite is 'discretionary', which means left to individual choice or judgment.

Question 14Integrated english, quant, formal, professional, ghana foundations

Complete the sentence: The commander's ________ decision-making during the crisis prevented unnecessary casualties and secured the perimeter.

  1. vacillating
  2. astute Correct answer.
  3. impetuous
  4. dilatory

Explanation

'Astute' means having or showing an ability to accurately assess situations and turn this to one's advantage. An astute decision-maker would successfully prevent casualties and secure a position.

Question 15Integrated english, quant, formal, professional, ghana foundations

Choose the word that best fits the blank: Because the battlefield communications were ________, the squad leaders had to rely on pre-established visual signals.

  1. unabated
  2. compromised Correct answer.
  3. expedited
  4. lucid

Explanation

'Compromised' in this context means damaged, intercepted, or made vulnerable. When radio communications are compromised, troops must switch to visual signals to maintain operational security.

Question 16Integrated english, quant, formal, professional, ghana foundations

What is the meaning of the word 'SUBORDINATE' when used as a noun in a military context?

  1. A superior officer who commands a battalion.
  2. A person under the authority or control of another within the chain of command. Correct answer.
  3. A tactical maneuver designed to flank the enemy.
  4. The supply depot responsible for distributing ammunition.

Explanation

As a noun, a 'subordinate' is someone of lower rank or position who reports to a superior officer in the military hierarchy.

Question 17Integrated english, quant, formal, professional, ghana foundations

Choose the grammatically correct sentence from the options below.

  1. Neither the sergeant nor the cadets was aware of the change in schedule.
  2. Neither the sergeant nor the cadets were aware of the change in schedule. Correct answer.
  3. Neither the sergeant nor the cadets is aware of the change in schedule.
  4. Neither the sergeant nor the cadets has been aware of the change in schedule.

Explanation

When subject parts are joined by 'neither... nor', the verb must agree with the subject closest to it. Here, 'cadets' (plural) is closest to the verb, so the plural verb 'were' is correct.

Question 18Integrated english, quant, formal, professional, ghana foundations

Identify the grammatical error in the following sentence: 'The logistics officer distributed the rations between the five infantry squads.'

  1. The verb 'distributed' should be changed to 'distributes' to maintain present tense.
  2. The word 'between' should be replaced with 'among' because it refers to more than two groups. Correct answer.
  3. The word 'rations' should be singular because it is a collective noun.
  4. The sentence contains no grammatical errors.

Explanation

Use 'between' when naming distinct, individual items (often two). Use 'among' when referring to items or people that are not distinct, or are part of a group of three or more. Since there are five squads, 'among' is correct.

Question 19Integrated english, quant, formal, professional, ghana foundations

In formal written English expressing a demand, fill the blank: The instructor insisted that every learner ________ the classroom worksheet.

  1. completes
  2. complete Correct answer.
  3. completed
  4. has completed

Explanation

The sentence explicitly expresses a demand in formal written English. A mandative subjunctive uses the base form complete for every subject. It does not report that a past completion actually occurred, and it gives no real military training instruction.

Question 20Integrated english, quant, formal, professional, ghana foundations

Choose the option that correctly completes the sentence: The recruits were exhausted after the drill, ________ they still had to clean their barracks.

  1. besides
  2. yet Correct answer.
  3. furthermore
  4. consequently

Explanation

'Yet' acts as a coordinating conjunction that establishes a contrast between the recruits' exhaustion and their remaining tasks. It is punctuated correctly with a comma before it.

Question 21Integrated english, quant, formal, professional, ghana foundations

Select the sentence that uses punctuation correctly.

  1. The Chief of Defence Staff, who was appointed last year, will inspect the parade. Correct answer.
  2. The Chief of Defence Staff who was appointed last year, will inspect the parade.
  3. The Chief of Defence Staff, who was appointed last year will inspect the parade.
  4. The Chief of Defence Staff who was appointed last year will inspect the parade.

Explanation

The clause 'who was appointed last year' is non-restrictive (parenthetical info about the Chief of Defence Staff) and must be set off by commas on both sides.

Question 22Integrated english, quant, formal, professional, ghana foundations

SOLDIER : REGIMENT :: ____________ : ____________

  1. Captain : Ship
  2. Star : Constellation Correct answer.
  3. Fleet : Ship
  4. Musician : Concert

Explanation

The relationship is member-to-group: a soldier is an individual part of a regiment. Similarly, a star is an individual part of a constellation.

Question 23Integrated english, quant, formal, professional, ghana foundations

FORTRESS : IMPENETRABLE :: ____________ : ____________

  1. Sanctuary : Dangerous
  2. Desert : Fertile
  3. swamp : Waterlogged Correct answer.
  4. Harbor : Exposed

Explanation

The relationship is noun-to-defining-characteristic: a fortress is designed to be impenetrable. Likewise, a swamp is naturally waterlogged.

Question 24Integrated english, quant, formal, professional, ghana foundations

TACTICIAN : STRATEGY :: ____________ : ____________

  1. Artillery : Cannon
  2. Novelist : Plot Correct answer.
  3. Soldier : Weapon
  4. Physician : Disease

Explanation

A tactician creates or executes a strategy. Similarly, a novelist designs or writes a plot.

Question 25Integrated english, quant, formal, professional, ghana foundations

INCIDENT : CRITICAL :: ____________ : ____________

  1. Skirmish : Major Correct answer.
  2. Disaster : Trivial
  3. Encounter : Hostile
  4. Campaign : Brief

Explanation

This is a relationship of degree/intensity: a critical incident is a severe or extreme incident. Similarly, a major skirmish is an intense version of a skirmish.

Question 26Integrated english, quant, formal, professional, ghana foundations

RETREAT : ADVANCE :: ____________ : ____________

  1. Capitulate : Surrender
  2. Curtail : Prolong Correct answer.
  3. Flank : Encircle
  4. Defend : Fortify

Explanation

Retreat and advance are opposite military actions (antonyms). Curtail (shorten/reduce) and prolong (lengthen/extend) are also antonyms.

Question 27Integrated english, quant, formal, professional, ghana foundations

Choose the option that corrects the underlined segment: 'The platoon commander ordered the squad to secure the perimeter, **having saw** suspicious movement near the treeline.'

  1. having seen Correct answer.
  2. having see
  3. having sawed
  4. having had seen

Explanation

The perfect participle phrase should use 'having' followed by the past participle of the verb. The past participle of 'see' is 'seen', making 'having seen' correct.

Question 28Integrated english, quant, formal, professional, ghana foundations

Correct the underlined portion: 'Every cadet in the barracks **have to keep their** gear clean.'

  1. have to keep his
  2. has to keep their
  3. has to keep his or her Correct answer.
  4. having to keep their

Explanation

The subject 'Every cadet' is singular and requires the singular verb 'has'. To maintain pronoun agreement, the singular pronoun phrase 'his or her' is grammatically correct instead of the plural 'their'.

Question 29Integrated english, quant, formal, professional, ghana foundations

What is the meaning of the military idiom 'to bite the bullet'?

  1. To test ammunition quality before combat.
  2. To face a difficult situation with courage and endurance. Correct answer.
  3. To surrender to superior enemy forces.
  4. To make a rash decision without consulting superiors.

Explanation

'Bite the bullet' means to endure a painful or difficult situation that is unavoidable with fortitude, originating from the historic practice of having wounded soldiers bite a lead bullet during surgery without anesthesia.

Question 30Integrated english, quant, formal, professional, ghana foundations

Replace the underlined words: 'The general was not satisfied with the report, **so he made the staff write it from scratch**.'

  1. consequently ordering the staff to rewrite it entirely. Correct answer.
  2. so he made the staff write it again from the beginning.
  3. hence he forced them to start writing it from the start.
  4. which led to the staff rewriting it from scratch.

Explanation

This option uses formal and precise language suitable for a professional context, avoiding the colloquial idiom 'from scratch' and redundant phrasing like 'again from the beginning'.

Question 31Integrated english, quant, formal, professional, ghana foundations

What does the phrase 'line of duty' refer to?

  1. The physical boundary separating two friendly armies.
  2. All actions performed as part of official military service and responsibilities. Correct answer.
  3. The radio frequency dedicated to officer commands.
  4. The sequence of promotions available to an enlisted soldier.

Explanation

'Line of duty' refers to actions or events that occur while a service member is performing their designated military responsibilities.

Question 32Integrated english, quant, formal, professional, ghana foundations

A military convoy traveling at a constant speed covers 270 kilometers in 4.5 hours. What is its speed in meters per second?

  1. 16.67 m/s Correct answer.
  2. 60 m/s
  3. 22.5 m/s
  4. 15 m/s

Explanation

First, calculate the speed in km/h: 270 km / 4.5 h = 60 km/h. To convert km/h to m/s, divide by 3.6: 60 / 3.6 = 16.67 m/s.

Question 33Integrated english, quant, formal, professional, ghana foundations

A cadet's score on three exams increases from 75 to 84, and then to 90. What is the average percentage increase per exam over these two steps?

  1. 10.0%
  2. 9.5% Correct answer.
  3. 10.5%
  4. 12.0%

Explanation

First increase: (84 - 75) / 75 = 9 / 75 = 12.0%. Second increase: (90 - 84) / 84 = 6 / 84 = 7.14%. Average increase = (12% + 7.14%) / 2 = 9.57% (closest is 9.5%).

Question 34Integrated english, quant, formal, professional, ghana foundations

A supply depot has enough food rations to sustain 120 soldiers for 30 days. If 30 additional soldiers join the unit, how many days will the rations last?

  1. 24 days Correct answer.
  2. 22.5 days
  3. 20 days
  4. 25 days

Explanation

The total supply is 120 * 30 = 3600 soldier-days. When 30 soldiers join, the total number of soldiers is 150. The rations will last: 3600 / 150 = 24 days.

Question 35Integrated english, quant, formal, professional, ghana foundations

In a battalion, 45% of the soldiers are deployed, 35% are in reserve, and the remaining 300 soldiers are in training. What is the total number of soldiers in the battalion?

  1. 1,200
  2. 1,500 Correct answer.
  3. 1,800
  4. 2,000

Explanation

The sum of deployed and reserve soldiers is 45% + 35% = 80%. This leaves 20% of the soldiers in training. If 20% equals 300, then the total number (100%) is 300 / 0.20 = 1,500 soldiers.

Question 36Integrated english, quant, formal, professional, ghana foundations

An officer purchases gear worth GH¢ 4,500. Due to a military discount, the price is reduced by 15%. If a sales tax of 5% is then added to the discounted price, what is the final amount paid?

  1. GH¢ 4,016.25 Correct answer.
  2. GH¢ 4,050.00
  3. GH¢ 3,825.00
  4. GH¢ 3,982.50

Explanation

Discounted price = 4500 * (1 - 0.15) = 4500 * 0.85 = GH¢ 3,825. Tax added = 3825 * 1.05 = GH¢ 4,016.25.

Question 37Integrated english, quant, formal, professional, ghana foundations

Solve for x in the equation: 3(x - 5) + 2x = 4(x + 3) - 7

  1. x = 20 Correct answer.
  2. x = 10
  3. x = 15
  4. x = 5

Explanation

Expand both sides: 3x - 15 + 2x = 4x + 12 - 7. Combine terms: 5x - 15 = 4x + 5. Subtract 4x from both sides: x - 15 = 5. Add 15 to both sides: x = 20.

Question 38Integrated english, quant, formal, professional, ghana foundations

Find the values of x and y that satisfy the system of linear equations: 2x + 3y = 13 x - 2y = -4

  1. x = 2, y = 3 Correct answer.
  2. x = 3, y = 2
  3. x = 1, y = 4
  4. x = 4, y = 1

Explanation

Multiply the second equation by 2: 2x - 4y = -8. Subtract this from the first equation: (2x + 3y) - (2x - 4y) = 13 - (-8) => 7y = 21 => y = 3. Substitute y = 3 back: x - 2(3) = -4 => x - 6 = -4 => x = 2. Thus, x = 2, y = 3.

Question 39Integrated english, quant, formal, professional, ghana foundations

Simplify the algebraic expression: (2x^2 * y^3)^3 / (4x^4 * y^5)

  1. 2x^2 * y^4 Correct answer.
  2. x^2 * y^2
  3. 2x * y^4
  4. 2x^2 * y^2

Explanation

First expand the numerator: (2x^2 * y^3)^3 = 8 * x^6 * y^9. Divide by the denominator: (8 * x^6 * y^9) / (4x^4 * y^5) = (8/4) * x^(6-4) * y^(9-5) = 2 * x^2 * y^4.

Question 40Integrated english, quant, formal, professional, ghana foundations

A training run has two stages. In the first stage, a cadet runs at an average speed of 8 km/h. In the second stage, the cadet runs at 12 km/h. If the total distance is 24 km and the total time is 2.5 hours, how long is the first stage in kilometers?

  1. 12 km Correct answer.
  2. 10 km
  3. 8 km
  4. 16 km

Explanation

Let d be the distance of the first stage. Then time t1 = d / 8 and time t2 = (24 - d) / 12. Total time t1 + t2 = 2.5 => d/8 + (24-d)/12 = 2.5. Multiply by 24: 3d + 2(24 - d) = 60 => 3d + 48 - 2d = 60 => d = 12 km.

Question 41Integrated english, quant, formal, professional, ghana foundations

The sum of the ages of a senior officer and a cadet is 56 years. Four years ago, the officer's age was three times the cadet's age. What is the current age of the cadet?

  1. 16 years Correct answer.
  2. 12 years
  3. 14 years
  4. 18 years

Explanation

Let O be officer age and C be cadet age. O + C = 56 => O = 56 - C. Four years ago: O - 4 = 3(C - 4). Substitute O: (56 - C) - 4 = 3C - 12 => 52 - C = 3C - 12 => 4C = 64 => C = 16 years.

Question 42Integrated english, quant, formal, professional, ghana foundations

A rectangular military parade ground has a perimeter of 480 meters. If the length is 40 meters longer than the width, what is the area of the ground?

  1. 14,000 square meters Correct answer.
  2. 13,600 square meters
  3. 15,200 square meters
  4. 12,800 square meters

Explanation

Perimeter = 2(L + W) = 480 => L + W = 240. Given L = W + 40. Substitute L: (W + 40) + W = 240 => 2W = 200 => W = 100 meters. Then L = 140 meters. Area = L * W = 140 * 100 = 14,000 m².

Question 43Integrated english, quant, formal, professional, ghana foundations

A cylindrical water storage tank at an outpost has a height of 5 meters and a base diameter of 4 meters. What is the volume of water it can hold when full? (Use pi = 3.1416)

  1. 62.83 cubic meters Correct answer.
  2. 125.66 cubic meters
  3. 31.42 cubic meters
  4. 78.54 cubic meters

Explanation

Base radius r = diameter / 2 = 2 meters. Volume of a cylinder = pi * r^2 * h = 3.1416 * (2^2) * 5 = 3.1416 * 4 * 5 = 3.1416 * 20 = 62.83 cubic meters.

Question 44Integrated english, quant, formal, professional, ghana foundations

In a right-angled triangle, the hypotenuse is 13 cm and one of the legs is 5 cm. What is the area of the triangle?

  1. 30 square centimeters Correct answer.
  2. 60 square centimeters
  3. 65 square centimeters
  4. 32.5 square centimeters

Explanation

Using the Pythagorean theorem, the other leg is sqrt(13^2 - 5^2) = sqrt(169 - 25) = sqrt(144) = 12 cm. Area of a right triangle = (base * height) / 2 = (5 * 12) / 2 = 30 cm².

Question 45Integrated english, quant, formal, professional, ghana foundations

A circle is inscribed inside a square of side 14 cm. What is the area of the region inside the square but outside the circle? (Use pi = 22/7)

  1. 42 square centimeters Correct answer.
  2. 154 square centimeters
  3. 196 square centimeters
  4. 56 square centimeters

Explanation

Area of the square = side^2 = 14^2 = 196 cm². The diameter of the inscribed circle is equal to the side of the square (14 cm), so radius r = 7 cm. Area of the circle = pi * r^2 = (22/7) * 7^2 = 154 cm². Area outside the circle = 196 - 154 = 42 cm².

Question 46Integrated english, quant, formal, professional, ghana foundations

If the sum of the interior angles of a regular polygon is 1,080 degrees, how many sides does the polygon have?

  1. 8 sides Correct answer.
  2. 6 sides
  3. 10 sides
  4. 7 sides

Explanation

The formula for the sum of interior angles is (n - 2) * 180 = Sum, where n is the number of sides. (n - 2) * 180 = 1080 => n - 2 = 6 => n = 8 sides (octagon).

Question 47Integrated english, quant, formal, professional, ghana foundations

Three officers invest capital in a cooperative in the ratio 3:4:5. If the total profit distributed is GH¢ 24,000, what is the share of the officer who received the least amount?

  1. GH¢ 6,000 Correct answer.
  2. GH¢ 8,000
  3. GH¢ 10,000
  4. GH¢ 4,000

Explanation

The total ratio parts are 3 + 4 + 5 = 12. The officer with the least share has 3 parts. Share = (3 / 12) * 24,000 = 6,000 GH¢.

Question 48Integrated english, quant, formal, professional, ghana foundations

A map uses a scale of 1:250,000. If the distance between a military base and a radar outpost on the map is 8 centimeters, what is the actual ground distance in kilometers?

  1. 20 km Correct answer.
  2. 200 km
  3. 2 km
  4. 25 km

Explanation

Actual distance = 8 cm * 250,000 = 2,000,000 cm. Convert to meters: 2,000,000 / 100 = 20,000 meters. Convert to kilometers: 20,000 / 1000 = 20 km.

Question 49Integrated english, quant, formal, professional, ghana foundations

A defensive wall is constructed by 15 engineers in 6 days. If the commanding officer wants an identical wall completed in exactly 4 days, how many engineers in total are required to work at the same rate?

  1. 22.5 engineers (which rounds to 23) Correct answer.
  2. 20 engineers
  3. 25 engineers
  4. 24 engineers

Explanation

Total work-rate = 15 engineers * 6 days = 90 engineer-days. To complete it in 4 days, the number of engineers required is 90 engineer-days / 4 days = 22.5 engineers. In practical scenarios, this requires hiring 23 engineers to guarantee completion.

Question 50Integrated english, quant, formal, professional, ghana foundations

An aircraft flies 1,200 km from Accra to a neighboring capital at an average speed of 400 km/h. On the return flight, it faces a headwind and travels at an average speed of 300 km/h. What is the average speed of the aircraft for the entire round trip?

  1. 342.86 km/h Correct answer.
  2. 350 km/h
  3. 360 km/h
  4. 333.33 km/h

Explanation

Average speed = Total distance / Total time. Round trip distance = 1200 * 2 = 2400 km. Outbound time = 1200 / 400 = 3 hours. Return time = 1200 / 300 = 4 hours. Total time = 7 hours. Average speed = 2400 / 7 = 342.86 km/h. Note that a simple arithmetic mean (350) is incorrect because the plane spent more time at the slower speed.