A train 150 meters long takes 20 seconds to cross a platform 250 meters long. Find the speed of the train in km/h. MCQ with Answer and Explanation

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A train 150 meters long takes 20 seconds to cross a platform 250 meters long. Find the speed of the train in km/h.

A. 72 km/h

B. 50 km/h

C. 64 km/h

D. 80 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Total distance = 150 + 250 = 400 meters. Time = 20 seconds. Speed = 400 / 20 = 20 m/s. Speed in km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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The speed of a boat in still water is 15 km/h and the speed of the current is 3 km/h. How much distance can the boat cover upstream in exactly 3 hours?

A. 36 km

B. 44 km

C. 32 km

D. 40 km

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Correct Answer: Option A

Explanation:
Upstream speed = 15 - 3 = 12 km/h. Distance covered in 3 hours = Upstream Speed * Time = 12 * 3 = 36 km.

This question belongs to: Maths Time Speed and Distance

Question #2

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A person walking at 4/5 of his usual speed reaches his office 10 minutes late. What is his usual time?

A. 50 minutes

B. 45 minutes

C. 35 minutes

D. 40 minutes

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Correct Answer: Option D

Explanation:
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 10 minutes. Usual time = 10 * 4 = 40 minutes.

This question belongs to: Maths Time Speed and Distance