a man sitting in a train which is traveling at 56 kmph observes that a goods train , traveling in opposite direction , takes 15 seconds to pass him . if the goods train is 410 m long , find its speed
"explanation : relative speed = 410 / 15 m / sec = ( ( 410 / 15 ) × ( 18 / 5 ) ) kmph = 98 kmph . speed of goods train = ( 98 - 56 ) kmph = 42 kmph answer : option d"
subtract(multiply(divide(410, 15), const_3_6), 56)