a train passes a platform in 30 seconds . the same train passes a man standing on the platform in 20 seconds . if the speed of the train is 54 km / hr , the length of the platform is
"explanation : speed of the train = 54 km / hr = ( 54 × 10 ) / 30 m / s = 15 m / s length of the train = speed × time taken to cross the man = 15 × 20 = 300 m let the length of the platform = l time taken to cross the platform = ( 300 + l ) / 15 = > ( 300 + l ) / 15 = 30 = > 300 + l = 15 × 30 = 450 = > l = 450 - 300 = 150 meter answer : option a"
multiply(multiply(const_0_2778, 54), subtract(30, 20))