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Relative Velocity

A train A whi...

Question

A train A which is 120 m long is running with velocity 20 m/s while train B which is 130 m long is running in opposite direction with velocity 30 m/s. What is the time taken by train B to cross the train A?

A

5 s

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B

25 s

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C

10 s

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D

100 s

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Solution

The correct option is A 5 s
For train $B$ with the respect to train $A,$
$v = 30 + 20 = 50 m / s (⟵) s = 120 + 130 = 250 m t = \frac{250}{50} = 5 s e c$

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