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

Question

A 210 meter long train is moving due North at a of 25 m / s . A small bird is flying due South a little above the train with speed 5 m / s . The time taken by the bird to cross the train is, 6s, 7s, 9s, 10s

MARKS App · Accepted Answer

Relative velocity of bird w.r.t train = 25 + 5 = 30 m / s time taken by the bird to cross the train t = 30 210 ​ = 7 sec

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