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A train 200 m long takes 20 seconds to cross a man walking at 10 kmph in a direction opposite to that of the train Find the speed of the train?

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28 kmph

30 kmph

26 kmph

32 kmph

answer is C.

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Detailed Solution

: Distance = 200 m, Time = 20 sec, Speed of man = 10 kmph

Relative speed of train = $\frac{D}{T} = \frac{200}{20} = 10 m / \sec$

$= 10 \times \frac{18}{5} = 36 k m p h$

$S p e e d o f t r a i n = (36 - 10) = 26 k m p h$

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