A train 480 metre long takes 36 sec to cross a man running at a speed of 7 km/hr in the direction same 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) = (480 × 18)/(36 × 5) ⇒ (x - 7) = (8640)/(180) ⇒ x – 7 = 48 ⇒ x = 48 + 7 = 55 km/hr
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