A train 120 meters long crosses a platform 280 meters long in 20 seconds. Find the speed of the train in km/h. MCQ with Answer and Explanation

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A train 120 meters long crosses a platform 280 meters long in 20 seconds. Find the speed of the train in km/h.

A. 80 km/h

B. 64 km/h

C. 84 km/h

D. 72 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

Total distance = 120 + 280 = 400 meters. Speed = 400 / 20 = 20 m/s. 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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A passenger train passes a single sign post in 8 seconds. If the length of the train is 160 meters, find its speed in km/h.

A. 80 km/h

B. 84 km/h

C. 64 km/h

D. 72 km/h

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Correct Answer: Option D

Explanation:
Speed = 160 / 8 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A boat can row 12 km/h in still water. If the river current flows at 3 km/h, find the time taken to row 45 km downstream.

A. 3 hours

B. 3.5 hours

C. 2.5 hours

D. 4 hours

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Correct Answer: Option A

Explanation:
Downstream speed = 12 + 3 = 15 km/h. Time taken = Distance / Downstream speed = 45 / 15 = 3 hours.

This question belongs to: Maths Time Speed and Distance

Question #3

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A motorboat covers 16 km downstream in 1 hour and covers the same distance upstream in 2 hours. Find the speed of the boat in still water.

A. 14 km/h

B. 12 km/h

C. 15 km/h

D. 10 km/h

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Correct Answer: Option B

Explanation:
Downstream speed = 16 / 1 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.

This question belongs to: Maths Time Speed and Distance

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