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1. The time taken by a train 180 m long, travelling at 42 kmph, in passing a person walking in the same direction at 6 kmph, will be

Solution:
Speed of train relative to man
= (42 - 6) kmph = 36 kmph
= (36×518)  m/sec
= 10 m/sec
∴ Time taken to pass the man
= 18010 sec
= 18 sec

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