A train of 150 m length is going towards North direction at a speed of 10 ms-1

A train of 150 m length is going towards North direction at a speed of 10 ms-1. A parrot flies at a speed of 5 ms-1 towards South direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

1) 12 s

2) 8 s

3) 15 s

4) 10 s

5) 5 s

Answer: 4) 10 s

Solution:

The relative velocity of the parrot w.r.t the train = 10 – (-5) = 15 m/s

Time taken to cross the train = 150/15 = 10 s

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