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Q.

Two trains, each 50 m long, are travelling in opposite directions with velocities 10 ms-1 and 15 ms-1. The time of their crossing each other is

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a

2 s

b

4 s

c

23

d

43

answer is B.

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Detailed Solution

Total length to be crossed = 50+50 = 100 m

Relative velocity = 10+15 = 25 m/s

Time taken = 10025 = 4 s

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