a train running at the speed of 240 km / hr crosses a pole in 21 seconds . what is the length of the train ?
"speed = ( 240 * 5 / 18 ) m / sec = ( 200 / 3 ) m / sec length of the train = ( speed x time ) = ( 200 / 3 * 21 ) m = 1400 m . answer : c"
multiply(divide(multiply(240, const_1000), const_3600), 21)