A 120 m long train is moving west at a s...

A 120 m long train is moving west at a speed of 10 m `s^-1`.A small bird flying cast at a speed of `5 ms^-1` crosses the train.What is the time taken by the bird to cross the train?

A

24 s

B

12 s

C

8s

D

4 s.

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