Question
A train 350 metre long takes 36 sec to cross a man
running at a speed of 5 km/hr in the direction opposite to that of train. What is the speed of the train?Solution
Let the speed of the train be x Relative speed = (x + 5) km/hr ⇒ (x + 5) = (350 × 18)/(36 × 5) ⇒ (x + 5) = (6300)/(180) ⇒ x + 5 = 35 ⇒ x = 35 – 5 = 30 km/hr
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