A train 120 meters long running at 45 km/h crosses a bridge in 30 seconds. Find the length of the bridge. MCQ with Answer and Explanation

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A train 120 meters long running at 45 km/h crosses a bridge in 30 seconds. Find the length of the bridge.

A. 270 meters

B. 255 meters

C. 285 meters

D. 230 meters

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed of train = 45 * (5/18) = 12.5 m/s. Total distance covered in 30 seconds = 12.5 * 30 = 375 meters. Length of bridge = 375 - 120 = 255 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A person can row 6 km/h in still water. If the speed of the stream is 2 km/h, how much time will he take to row a distance of 16 km downstream?

A. 5 hours

B. 4 hours

C. 2 hours

D. 3 hours

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Correct Answer: Option C

Explanation:
Downstream speed = 6 + 2 = 8 km/h. Time = Distance / Speed = 16 / 8 = 2 hours.

This question belongs to: Maths Time Speed and Distance

Question #2

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A merchant van covers 120 km at 40 km/h, 180 km at 60 km/h and 100 km at 50 km/h. Find the net average speed.

A. 50 km/h

B. 54 km/h

C. 52 km/h

D. 48 km/h

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Correct Answer: Option A

Explanation:
Total distance = 120 + 180 + 100 = 400 km. Total time = (120/40) + (180/60) + (100/50) = 3 + 3 + 2 = 8 hours. Average speed = 400 / 8 = 50 km/h.

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Question #3

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Two trains 140 meters and 160 meters long are running in opposite directions at speeds of 50 km/h and 58 km/h respectively. In what time will they cross each other?

A. 10 seconds

B. 12 seconds

C. 9 seconds

D. 11 seconds

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Correct Answer: Option A

Explanation:
Total distance = 140 + 160 = 300 meters. Relative speed in opposite directions = 50 + 58 = 108 km/h = 30 m/s. Time taken = 300 / 30 = 10 seconds.

This question belongs to: Maths Time Speed and Distance

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