Two train of each of length 350 m are running in the opposite direction with the velocities of 55 km/h and 72 km/h. At what time they will be completely across wash other
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Relative speed = 72 + 108 = 180 km/hr
Length of both train = 180 × (5/18) × 10 = 500 m
Length of train = 500/2 = 250
Time taken to cross platform = (250 + 350)/72 × 5/18 = 30 sec.
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