A man sitting in a train which is travelling at 20 kmph observes that a goods train, travelling in opposite direction, takes 18 seconds to pass him. If the goods train is 300 m long, find its speed.

20 kmph

40 kmph

56 kmph

60 kmph

Relative Speed = (300 / 18)m/sec = (300/18 x 18/5) = 60 kmph. Speed of the train = (60 - 20)kmph = 40 kmph.

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