a train running at the speed of 50 km / hr crosses a pole in 9 sec . what is the length of the train ?
"speed = 50 * 5 / 18 = 125 / 9 m / sec length of the train = speed * time = 125 / 9 * 9 = 125 m answer : a"
multiply(divide(multiply(50, const_1000), const_3600), 9)