a train 310 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 = 310 + 140 = 450 m required time = 450 * 2 / 25 = 36 sec answer : option d"
divide(310, multiply(subtract(45, 140), const_0_2778))