a train 3000 m long can cross an electric pole in 120 sec and then find the speed of the train ?
"length = speed * time speed = l / t s = 3000 / 120 s = 25 m / sec speed = 25 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 90 kmph answer : a"
divide(divide(3000, const_1000), divide(120, const_3600))