Question
 A train 200m long crosses a 300m platform in 25 sec.
Find time taken to cross a man running at 18 km/hr in opposite direction.Solution
Train Speed = (200+300)/25 = 20 m/s. Man Speed = 18 km/hr = 5 m/s. Relative Speed = 20 + 5 = 25 m/s. Time = 200 / 25 = 8 sec.
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