A train 120 meters long is traveling at 72 km/h. How long will it take to cross a platform 180 meters long? MCQ with Answer and Explanation

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A train 120 meters long is traveling at 72 km/h. How long will it take to cross a platform 180 meters long?

A. 17 seconds

B. 13 seconds

C. 15 seconds

D. 19 seconds

Answer: Option C

Solution (By JKSSB Mock Tests)

Speed of train = 72 * (5/18) = 20 m/s. Total distance = 120 + 180 = 300 meters. Time taken = 300 / 20 = 15 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train traveling at 72 km/h crosses a static tunnel in 15 seconds. If the length of the train is 100 meters, find the length of the tunnel.

A. 200 meters

B. 180 meters

C. 220 meters

D. 240 meters

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Correct Answer: Option A

Explanation:
Speed of train = 72 * (5/18) = 20 m/s. Total distance covered in 15 seconds = 20 * 15 = 300 meters. Length of tunnel = 300 - 100 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train cross a pole in 12 seconds. If the speed of the train is 72 km/h, what is the length of the train?

A. 320 meters

B. 240 meters

C. 200 meters

D. 280 meters

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Correct Answer: Option B

Explanation:
Speed = 72 * (5/18) = 20 m/s. Length = Speed * Time = 20 * 12 = 240 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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The speed of two bodies are in the ratio 3 : 5. If they cover the same distance, what is the ratio of the time taken by them?

A. 9 : 25

B. 25 : 9

C. 5 : 3

D. 3 : 5

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Correct Answer: Option C

Explanation:
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/3 : 1/5 = 5 : 3.

This question belongs to: Maths Time Speed and Distance

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