a train 240 m long is running at a speed of 60 km / hr . in what time will it pass a bridge 240 m long ?
"total length = 240 + 240 = 480 speed = 60 km / h = ( 60 * 5 ) / 18 = 50 / 3 m / s time = ( 480 * 3 ) / 50 = 28.8 sec . answer : a"
divide(240, multiply(subtract(60, 240), const_0_2778))