a train 260 m long is running at a speed of 45 km / hr . in what time will it pass a bridge 140 m long ?
"speed = 45 * 5 / 18 = 25 / 2 m / sec total distance covered = 260 + 140 = 400 m required time = 400 * 2 / 25 = 32 sec answer : b"
divide(260, multiply(subtract(45, 140), const_0_2778))