a train running at the speed of 54 km / hr crosses a pole in 9 sec . what is the length of the train ?
"speed = 54 * 5 / 18 = 15 m / sec length of the train = speed * time = 15 * 9 = 135 m answer : c"
multiply(divide(multiply(54, const_1000), const_3600), 9)