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A train of 150m length is going towards north direction at a speed of 10m/s. A parrot flies at a speed of 5m/s 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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12s

15s

10s

answer is D.

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Detailed Solution

Relative velocity of the bird with respect to the train is

$V_{B T} = V_{B} + V_{T} = 5 + 10 = 15 m / s$ [because they are going in opposite direction]

$∴$ time taken by the bird to cross the train = $\frac{150}{5} = 10 s$

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