how many seconds will a train 250 meters long take to cross a platform 200 meters long if the speed of the train is 90 kmph ?
"d = 250 + 200 = 450 s = 90 * 5 / 18 = 25 mps t = 450 / 25 = 18 sec a ) 18 sec"
divide(add(200, 250), multiply(90, const_0_2778))