a train 280 m long is running at a speed of 54 km / hr . in what time will it pass a bridge 200 m long ?
"total length = 280 + 200 = 480 speed = 54 km / h = ( 54 * 5 ) / 18 = 15 / 1 m / s time = ( 480 * 1 ) / 15 = 32 sec . answer : a"
divide(280, multiply(subtract(54, 200), const_0_2778))