a train running at the speed of 30 km / hr crosses a pole in 12 seconds . what is the length of the train ?
"speed = ( 30 x ( 5 / 18 ) m / sec = ( 25 / 3 ) m / sec . length of the train = ( speed x time ) . length of the train = ( ( 25 / 3 ) x 12 ) m = 100 m d"
multiply(divide(multiply(30, const_1000), const_3600), 12)