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

Question

A train of 150 m length is going towards north direction at a speed of 10 m s - 1 . A parrot flies at a speed of 5 m s - 1 towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to, 12 s, 8 s, 15 s, 10 s

MARKS App · Accepted Answer

The relative velocity of the bird with respect to the train is : ⇒ V → BT = V → B − V → T V BT = 5 − − 10 = 15 m s - 1 [because they are going in the opposite direction] ∴ time taken by the bird to cross the train = 1 5 0 15 = 1 0 s

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