how long does a train 110 m long running at the speed of 72 km / hr takes to cross a bridge 142 m length ?
"speed = 72 * 5 / 18 = 20 m / sec total distance covered = 110 + 142 = 252 m . required time = 252 / 20 = 12.6 sec . answer : b"
divide(add(110, 142), multiply(72, const_0_2778))