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  4. 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

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Q. 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

KEAMKEAM 2004Motion in a Plane

Solution:

Relative velocity of the parrot w.r.t. the train
$=[10-(-5)] \,m / s =15\, m / s$
Time taken by the parrot to cross the train
$=\frac{150}{15}=10\, s$