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

Step-by-step solution

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