a train 650 m long is running at a speed of 117 km / hr . in what time will it pass a bridge 325 m long ?
"speed = 117 * 5 / 18 = 65 / 2 m / sec total distance covered = 650 + 325 = 975 m required time = 975 * 2 / 65 = 30 sec answer : a"
divide(650, multiply(subtract(117, 325), const_0_2778))