how long does a train 120 m long running at the speed of 70 km / hr takes to cross a bridge 145 m length ?
"speed = 70 * 5 / 18 = 19 m / sec total distance covered = 120 + 145 = 265 m . required time = 265 / 19 = 13.9 sec . answer : d"
divide(add(120, 145), multiply(70, const_0_2778))