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A train of length 120 m travels at a spe...

A train of length 120 m travels at a speed of 57 km/h. In what time it will pass a man who is walking at 3 km/h in the opposite direction?

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The correct Answer is:
7.2 s
`v_(AB)=v_(A)+v_(B)`, relative velocity A w.r.t. B
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