how long does a train 130 m long running at the speed of 80 km / hr takes to cross a bridge 140 m length ?
"speed = 80 * 5 / 18 = 22 m / sec total distance covered = 130 + 140 = 270 m . required time = 270 / 22 = 12.3 sec . answer : b"
divide(add(130, 140), multiply(80, const_0_2778))