how long does a train 110 m long running at the speed of 72 km / hr takes to cross a bridge 175 m length ?
"speed = 72 * 5 / 18 = 20 m / sec total distance covered = 110 + 175 = 285 m . required time = 285 / 20 = 14.25 sec . answer : e"
divide(add(110, 175), multiply(72, const_0_2778))