1.

A 150 m long train is moving to north at aspeed of 10 m/s. A parrot flying towardssouth with a speed of 5m/s crosses the train.The time taken by the parrot to cross the trainwould be

Answer»

Distance to be covered by the parrot=150m

speed of train=10m/s

speed of parrot=5m/s

now consider the train with respect to parrot and not with respect to land.

velocity of parrot=5

velocity of train=-10(∵the train is in opposite direction)

so relative velocity of train w r t parrot = 5 - (-10)=15m/s

now time = distance/speed = 150/15= 10s

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