a train passes a station platform in 36 sec and a man standing on the platform in 25 sec . if the speed of the train is 54 km / hr . what is the length of the platform ?
"speed = 54 * 5 / 18 = 15 m / sec . length of the train = 15 * 25 = 375 m . let the length of the platform be x m . then , ( x + 375 ) / 36 = 15 = > x = 165 m . answer : e"
multiply(25, multiply(54, const_0_2778))