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

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

TestHub · Accepted Answer

The relative velocity of the bird with respect to the train is :

$\Rightarrow {\vec{V}}_{BT} = {\vec{V}}_{B} - {\vec{V}}_{T}$
$|V_{BT}| = 5 - (- 10) = 15 m s^{- 1}$
[because they are going in the opposite direction]

$∴$ time taken by the bird to cross the train $= \frac{150}{15} = 10 s$

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