A train 180 meters long running at 72 km/h crosses a modern platform in 20 seconds. Find the length of the platform. MCQ with Answer and Explanation

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A train 180 meters long running at 72 km/h crosses a modern platform in 20 seconds. Find the length of the platform.

A. 220 meters

B. 240 meters

C. 200 meters

D. 250 meters

Answer: Option A

Solution (By JKSSB Mock Tests)

Speed of train = 72 * (5/18) = 20 m/s. Total distance covered in 20 seconds = 20 * 20 = 400 meters. Length of platform = Total distance - Length of train = 400 - 180 = 220 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person can row 10 km/h in still water. If the speed of the river current is 3 km/h, find the time taken to row 28 km upstream.

A. 6 hours

B. 4 hours

C. 5 hours

D. 3 hours

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Correct Answer: Option B

Explanation:
Upstream speed = 10 - 3 = 7 km/h. Time taken = 28 / 7 = 4 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train passes a static post in 12 seconds. If the speed of the train is 60 km/h, what is the length of the train?

A. 180 meters

B. 240 meters

C. 220 meters

D. 200 meters

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Correct Answer: Option D

Explanation:
Speed of train = 60 * (5/18) = 50/3 m/s. Length of train = Speed * Time = (50/3) * 12 = 200 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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A courier covers 40 km of his shift route at 20 km/h and the remaining 60 km at 30 km/h. Find his average speed across the whole shift.

A. 28 km/h

B. 25 km/h

C. 24 km/h

D. 26 km/h

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Correct Answer: Option B

Explanation:
Total distance = 40 + 60 = 100 km. Time for first sector = 40 / 20 = 2 hours. Time for second sector = 60 / 30 = 2 hours. Total time = 4 hours. Average speed = 100 / 4 = 25 km/h.

This question belongs to: Maths Time Speed and Distance

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