A train cross a pole in 12 seconds. If the speed of the train is 72 km/h, what is the length of the train? MCQ with Answer and Explanation

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A train cross a pole in 12 seconds. If the speed of the train is 72 km/h, what is the length of the train?

A. 280 meters

B. 240 meters

C. 320 meters

D. 200 meters

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed = 72 * (5/18) = 20 m/s. Length = Speed * Time = 20 * 12 = 240 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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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. 81 km/h

B. 85 km/h

C. 75 km/h

D. 90 km/h

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Correct Answer: Option A

Explanation:
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

Question #2

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A modern coach bus covers a distance of 280 km in 4 hours 40 minutes. Find its average speed.

A. 60 km/h

B. 56 km/h

C. 68 km/h

D. 64 km/h

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Correct Answer: Option A

Explanation:
Time = 4 hours 40 minutes = 4 + 40/60 = 4.666 hours = 14/3 hours. Speed = Distance / Time = 280 / (14/3) = 280 * 3 / 14 = 20 * 3 = 60 km/h.

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Question #3

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A person covers a distance of 12 km in 1 hour 30 minutes. What is his speed in meters per second?

A. 2.77 m/s

B. 2.22 m/s

C. 2.50 m/s

D. 2.00 m/s

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Correct Answer: Option B

Explanation:
Time = 1.5 hours. Speed = 12 / 1.5 = 8 km/h. To convert into m/s, multiply by 5/18. Speed = 8 * (5/18) = 40 / 18 = 2.22 m/s.

This question belongs to: Maths Time Speed and Distance

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