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