A passenger train 140 meters long passes an active bridge platform 310 meters long in 20 seconds. What is the speed of the train in km/h? MCQ with Answer and Explanation

Question

A passenger train 140 meters long passes an active bridge platform 310 meters long in 20 seconds. What is the speed of the train in km/h?

A. 90 km/h

B. 81 km/h

C. 85 km/h

D. 75 km/h

Answer: Option B

Solution (By JKSSB Mock Tests)

Total distance = 140 + 310 = 450 meters. Speed = 450 / 20 = 22.5 m/s. In km/h = 22.5 * (18/5) = 4.5 * 18 = 81 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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Walking at 6/7 of his usual speed, a man reaches his destination 10 minutes late. What is his usual time to reach the destination?

A. 50 minutes

B. 60 minutes

C. 80 minutes

D. 70 minutes

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Correct Answer: Option B

Explanation:
New speed = 6/7 of usual speed => New time = 7/6 of usual time. Difference = 1/6 of usual time = 10 minutes. Usual time = 10 * 6 = 60 minutes.

This question belongs to: Maths Time Speed and Distance

Question #2

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A train running at 75 km/h overtakes a motor cyclist riding at 15 km/h in the same direction in 15 seconds. Find the absolute length of the train.

A. 220 meters

B. 270 meters

C. 300 meters

D. 250 meters

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Correct Answer: Option D

Explanation:
Relative speed = 75 - 15 = 60 km/h = 60 * (5/18) = 50/3 m/s. Length of train = Relative speed * Time = (50/3) * 15 = 250 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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A sound wave travels at 330 m/s. How long does it take to cover a distance of 3.3 km?

A. 8 seconds

B. 14 seconds

C. 12 seconds

D. 10 seconds

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Correct Answer: Option D

Explanation:
Distance = 3.3 km = 3300 meters. Time taken = 3300 / 330 = 10 seconds.

This question belongs to: Maths Time Speed and Distance

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