how long does a train 140 m long running at the speed of 72 km / hr takes to cross a bridge 132 m length ?
"speed = 72 * 5 / 18 = 20 m / sec total distance covered = 140 + 132 = 272 m . required time = 272 / 20 = 13.6 sec . answer : a"
divide(add(140, 132), multiply(72, const_0_2778))