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Two trains, each 50 m long, are travelli...

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.

A

2 s

B

4 s

C

`2sqrts`

D

`4sqrt3s`

Text Solution

Verified by Experts

The correct Answer is:
B
Total length of train = 50 + 50 = 100 m
Relative velocity `= 10 - (-15) =25 ms^(-1)`
Time of crossing ` = (100)/25 = 4s`
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