a train 360 m long is running at a speed of 72 km / hr . in what time will it pass a bridge 140 m long ?
"speed = 72 * 5 / 18 = 20 m / sec total distance covered = 360 + 140 = 500 m required time = 500 * 1 / 20 = 25 sec answer : c"
divide(360, multiply(subtract(72, 140), const_0_2778))