A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race? MCQ with Answer and Explanation

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A marathon runner runs a distance of 42 km at a uniform speed of 12 km/h. What is the time taken to finish the race?

A. 4 hours

B. 3 hours 20 minutes

C. 3 hours 30 minutes

D. 3 hours 45 minutes

Answer: Option C

Solution (By JKSSB Mock Tests)

Time = Distance / Speed = 42 / 12 = 3.5 hours = 3 hours 30 minutes.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A locomotive running at 54 km/h takes 20 seconds to completely cross a platform. If it takes 8 seconds to pass a standing point observer, find the platform length.

A. 220 meters

B. 200 meters

C. 160 meters

D. 180 meters

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Correct Answer: Option D

Explanation:
Speed of train = 54 * (5/18) = 15 m/s. Length of train = Speed * Time to cross observer = 15 * 8 = 120 meters. Total distance to cross platform = Speed * Time = 15 * 20 = 300 meters. Platform length = 300 - 120 = 180 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man covers a distance of 24 km in 3 hours. If he doubles his speed, how much time will he take to cover a distance of 32 km?

A. 3 hours

B. 2 hours

C. 4 hours

D. 1 hour

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Correct Answer: Option B

Explanation:
Original speed = 24 / 3 = 8 km/h. Doubled speed = 16 km/h. Time required for 32 km = 32 / 16 = 2 hours.

This question belongs to: Maths Time Speed and Distance

Question #3

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A person covers a distance of 60 km at 15 km/h and another 40 km at 20 km/h. Find his average speed for the full journey.

A. 18.0 km/h

B. 16.0 km/h

C. 17.5 km/h

D. 16.66 km/h

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Correct Answer: Option D

Explanation:
Total distance = 60 + 40 = 100 km. Time 1 = 60 / 15 = 4 hours. Time 2 = 40 / 20 = 2 hours. Total time = 6 hours. Average speed = 100 / 6 = 16.66 km/h.

This question belongs to: Maths Time Speed and Distance

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