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Relative Velocity

A 210 meter l...

Question

A 210 meter long train is moving due North at a velocity of 25m/s. A small bird is flying due South a little above the train with speed 5m/s. The time taken by the bird to cross the train is

A

6s

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B

7s

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C

9s

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D

10s

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Solution

The correct option is B 7s
Relative velocity of bird w.r.t train=25+5=30 m/s.

time taken by the bird to cross the train $t = \frac{210}{30} = 7 s e c$

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