A train running at 90 km/h crosses a platform double its length in 36 seconds. What is the length of the platform? MCQ with Answer and Explanation

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A train running at 90 km/h crosses a platform double its length in 36 seconds. What is the length of the platform?

A. 500 meters

B. 600 meters

C. 400 meters

D. 750 meters

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed of train = 90 * (5/18) = 25 m/s. Total distance covered in 36 seconds = 25 * 36 = 900 meters. Let train length be L, so platform length = 2L. L + 2L = 900 => 3L = 900 => L = 300 meters. Platform length = 2L = 600 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A boat rowed downstream covers 40 km in 4 hours and manages 20 km upstream in 4 hours. Find the baseline speed of the boat in still water.

A. 7.0 km/h

B. 8.5 km/h

C. 8.0 km/h

D. 7.5 km/h

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Correct Answer: Option D

Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A man walks at a speed of 6 km/h instead of 5 km/h and thereby covers 12 km more in the same duration. Find the actual distance covered by him at his normal speed.

A. 50 km

B. 80 km

C. 72 km

D. 60 km

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Correct Answer: Option D

Explanation:
Let duration be t hours. Distance difference = 6t - 5t = t = 12 hours. Distance at normal speed (5 km/h) = 5 * 12 = 60 km.

This question belongs to: Maths Time Speed and Distance