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Q.

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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a

12s

b

8s

c

15s

d

10s

answer is D.

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Detailed Solution

Relative velocity of the bird with respect to the train is

VBT=VB+VT=5+10=15m/s  [because they are going in opposite direction]

 

∴   time taken by the bird to cross the train = 1505=10s

 

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