a train 500 m long can cross an electric pole in 20 sec and then find the speed of the train ?
"length = speed * time speed = l / t s = 500 / 20 s = 25 m / sec speed = 25 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 90 kmph answer : d"
divide(divide(500, const_1000), divide(20, const_3600))