Question 200

A 210 m long train takes 6 s to cross a man running at 9 km/h in a direction opposite to that of the train. What is the speed of the train? (in km/h)

Solution

Speed of train = x

Relative speed = x + 9(5/18) = x + 2.5

Speed = 210/6 = 35m/s

x + 2.5 = 35 => x = 32.5 m/s = 32.5 * (18/5) = 6.5 * 18 = 117 kmph

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