A train 140 meters long tracking at 63 km/h passes a modern bridge in 24 seconds. Find the length of the bridge. MCQ with Answer and Explanation

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A train 140 meters long tracking at 63 km/h passes a modern bridge in 24 seconds. Find the length of the bridge.

A. 260 meters

B. 300 meters

C. 280 meters

D. 320 meters

Answer: Option C

Solution (By JKSSB Mock Tests)

Speed of train = 63 * (5/18) = 17.5 m/s. Total distance handled in 24 seconds = 17.5 * 24 = 420 meters. Length of the bridge = 420 - 140 = 280 meters.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A boat crew rows 32 km downstream in 2 hours and handles 16 km upstream in 2 hours flat. Find the speed index of the stream current flow.

A. 5.0 km/h

B. 3.5 km/h

C. 4.5 km/h

D. 4.0 km/h

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Correct Answer: Option D

Explanation:
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed of current stream flow = (16 - 8) / 2 = 8 / 2 = 4 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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In a 100-meter race, A can beat B by 10 meters and C by 19 meters. In a race of 90 meters, by how many meters can B beat C?

A. 9 meters

B. 8 meters

C. 11 meters

D. 10 meters

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Correct Answer: Option A

Explanation:
When A covers 100m, B covers 90m and C covers 81m. This means in a distance where B covers 90 meters, C covers 81 meters. Therefore, B beats C by 90 - 81 = 9 meters.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train passes a static platform signal mast in 15 seconds and clears the 250-meter platform sector itself in 25 seconds. Find the length of the train.

A. 350 meters

B. 400 meters

C. 325 meters

D. 375 meters

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Correct Answer: Option D

Explanation:
Time allocated to clear the platform alone = 25 - 15 = 10 seconds. Speed of train = 250 / 10 = 25 m/s. Length of train = Speed * Time to pass mast = 25 * 15 = 375 meters.

This question belongs to: Maths Time Speed and Distance

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