a train 650 m long is running at a speed of 81 km / hr . in what time will it pass a bridge 340 m long ?
"speed = 81 * 5 / 18 = 45 / 2 m / sec total distance covered = 650 + 340 = 990 m required time = 990 * 2 / 45 = 44 sec answer : c"
divide(650, multiply(subtract(81, 340), const_0_2778))