a train 360 m long is running at a speed of 60 km / hr . in what time will it pass a bridge 140 m long ?
"speed = 60 * 5 / 18 = 50 / 3 m / sec total distance covered = 360 + 140 = 500 m required time = 500 * 3 / 50 = 30 sec answer : b"
divide(360, multiply(subtract(60, 140), const_0_2778))