How many seconds will a 500 m long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train , if the speed of the train is 63 km / hr?

How many seconds will a 500 m long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train , if the speed of the train is 63 km / hr? Correct Answer 30

Relative speed = (63 - 3) km/hr = 60 km/hr ∴ 60 km/hr = (60) ×518) m/sec  = 503 m/sec .'. Time taken to pass the man  = (500×350)m  = 30 sec 
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