a train running at the speed of 52 km / hr crosses a pole in 9 sec . what is the length of the train ?
"speed = 52 * 5 / 18 = 130 / 9 m / sec length of the train = speed * time = 130 / 9 * 9 = 130 m answer : a"
multiply(divide(multiply(52, const_1000), const_3600), 9)