A train 450 metre long takes 60 sec to cross a man running at a speed of 7 km/hr in the direction opposite to that of train. What is the speed of the train?
Let the speed of the train be x Relative speed = (x + 7) km/hr ⇒ (x + 7) = (450 × 18)/(60 × 5) ⇒ (x + 7) = (8100)/(300) ⇒ x + 7 = 27 ⇒ x = 27 – 7 = 20 km/hr
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