A car climbs a mountain path 12 km long at 4 km/h and descends the same distance at 12 km/h. Find the average speed for the round journey. MCQ with Answer and Explanation

Question

A car climbs a mountain path 12 km long at 4 km/h and descends the same distance at 12 km/h. Find the average speed for the round journey.

A. 5 km/h

B. 7 km/h

C. 8 km/h

D. 6 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Average Speed = 2xy / (x + y) = (2 * 4 * 12) / (4 + 12) = 96 / 16 = 6 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A boat can row 16 km/h in still water and the speed of the current is 4 km/h. Find the time taken to row 60 km downstream.

A. 3.0 hours

B. 2.5 hours

C. 4.0 hours

D. 3.5 hours

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Correct Answer: Option A

Explanation:
Downstream speed = 16 + 4 = 20 km/h. Time taken = 60 / 20 = 3 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A wheel has a radius of 42 cm. How many revolutions must it make to cover a distance of 132 meters?

A. 50 revolutions

B. 60 revolutions

C. 70 revolutions

D. 40 revolutions

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Correct Answer: Option A

Explanation:
Circumference of the wheel = 2 * (22/7) * 42 = 264 cm = 2.64 meters. Total distance = 132 meters. Number of revolutions = 132 / 2.64 = 50 revolutions.

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Question #3

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A sound wave travels at 340 m/s. How much distance in kilometers does it cover in exactly 15 seconds?

A. 5.7 km

B. 5.1 km

C. 5.4 km

D. 4.8 km

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Correct Answer: Option B

Explanation:
Distance = Speed * Time = 340 * 15 = 5100 meters. Converting to kilometers = 5100 / 1000 = 5.1 km.

This question belongs to: Maths Time Speed and Distance

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