A 400 m long train takes 36 s to cross a man walking at 20 km/h in the direction opposite to that of the train. What is the speed of the train?

20 km/h
30 km/h
15 km/h
11 km/h

Correct Answer: 20 km/h

Explanation:

Relative speed of train = 400/36 m/s = 400/36 x (18/5) = 40 km/h
Relative speed of train = Speed of train + Speed of man
⇒ 40 = Speed of train + 20
∴ Speed of train = 40 - 20 = 20 km/h

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