how long does a train 200 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 = 200 + 132 = 332 m . required time = 332 / 20 = 16.6 sec . answer : e"
divide(add(200, 132), multiply(72, const_0_2778))