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A train of 150 meter length is going towards north direction at a speed of sec / 10 m . A parrot flies at the speed of sec / 5 m towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

1. 12 sec
2. 8 sec
3. 15 sec
4. 10 sec

Correct answer: 10 sec

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