a train running at the speed of 72 km / hr crosses a pole in 9 seconds . what is the length of the train ?
"speed = ( 72 * 5 / 18 ) m / sec = ( 20 ) m / sec length of the train = ( speed x time ) = ( 20 * 9 ) m = 180 m . answer : d"
multiply(divide(multiply(72, const_1000), const_3600), 9)