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14, A 100 m long train crosses a man travelling atm/hr, in opposite direction, in 7.2 seconds thenthe velocity of train is :(1) 40 km/hr(3) 20 km/hr5 k(2) 25 km/hr(4) 45 km/hr

Answer»

Length of train = 100 m =.1 kmLet velocity of train is vTime taken = 7.2 sec = 7.2/3600

Distance = speed x time .1 = (v + 5)7.2/3600v + 5 = 3600/72 v + 5 = 50v = 45 km/hr

Velocity of train = 45km/hr



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