a train 360 m long is running at a speed of 36 km / hr . in what time will it pass a bridge 140 m long ?
"speed = 36 * 5 / 18 = 10 m / sec total distance covered = 360 + 140 = 500 m required time = 500 * 1 / 10 = 50 sec answer : a"
divide(360, multiply(subtract(36, 140), const_0_2778))