a train 360 m long is running at a speed of 45 km / hr . in what time will be pass a bridge 140 m long ?
"sol . speed = [ 45 x 5 / 18 ] m / sec = 25 / 2 m / sec . total distance covered = ( 360 + 140 ) m = 500 m . ∴ required time = ( 500 x 2 / 25 ) sec = 40 sec . answer a"
divide(360, multiply(subtract(45, 140), const_0_2778))