A train 120 meters long passes an entry post light in 6 seconds. How many seconds will it require to cross a terminal platform bridge 240 meters long? MCQ with Answer and Explanation

Question

A train 120 meters long passes an entry post light in 6 seconds. How many seconds will it require to cross a terminal platform bridge 240 meters long?

A. 20 seconds

B. 18 seconds

C. 22 seconds

D. 15 seconds

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform bridge layout = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A car ascends an incline path 24 km long at 6 km/h and maps the return path descent at 12 km/h. Find the net average speed for the round course.

A. 8.8 km/h

B. 7.2 km/h

C. 9.6 km/h

D. 8.0 km/h

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Correct Answer: Option D

Explanation:
Average Speed = 2xy / (x + y) = (2 * 6 * 12) / (6 + 12) = 144 / 18 = 8 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A motorboat maps 32 km downstream in 2 hours and tracks the same upriver stretch upstream in 4 hours. Find the baseline speed of the boat hull in still water.

A. 12 km/h

B. 15 km/h

C. 10 km/h

D. 14 km/h

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Correct Answer: Option A

Explanation:
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 32 / 4 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.

This question belongs to: Maths Time Speed and Distance