A passenger notice that a train passes him in 4 seconds. If the train is 120 meters long, what is its speed in km/h? MCQ with Answer and Explanation

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A passenger notice that a train passes him in 4 seconds. If the train is 120 meters long, what is its speed in km/h?

A. 108 km/h

B. 100 km/h

C. 90 km/h

D. 120 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Speed = 120 / 4 = 30 m/s. In km/h = 30 * (18/5) = 108 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A train passes a standing man in 10 seconds and a platform 300 meters long in 25 seconds. Find the length of the train.

A. 150 meters

B. 300 meters

C. 250 meters

D. 200 meters

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Correct Answer: Option A

Explanation:
The train takes 25 - 10 = 15 seconds to cover the length of the platform. Speed of the train = 300 / 15 = 20 m/s. Length of the train = Speed * Time to cross the man = 20 * 10 = 150 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A boatman rows 1 km in 5 minutes along the stream and 1 km in 12 minutes against the stream. Find the speed of the stream.

A. 4 km/h

B. 4.5 km/h

C. 3.5 km/h

D. 5 km/h

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Correct Answer: Option C

Explanation:
Downstream speed = 1 km / (5/60 hours) = 12 km/h. Upstream speed = 1 km / (12/60 hours) = 5 km/h. Speed of stream = (Downstream speed - Upstream speed) / 2 = (12 - 5) / 2 = 3.5 km/h.

This question belongs to: Maths Time Speed and Distance