a train 90 m long is running at 20 kmph . in how much time will it pass a platform 80 m long ?
distance travelled = 90 + 80 m = 170 m speed = 20 * 5 / 8 = 25 / 2 m time = 170 * 2 / 25 = 13.6 seconds answer : d .
divide(add(90, 80), multiply(20, const_0_2778))