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Q.

A 210 m long train is moving due to North at a speed 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

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a

6 s

b

7 s

c

9 s

d

10 s

answer is B.

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Detailed Solution

Relative velocity of bird w.r.t. train = 25 + 5 = 30 m/s Time taken by the bird to cross the train $t = \frac{210}{30} = 7 s$

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A 210 m long train is moving due to North at a speed 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