how long does a train 130 m long running at the speed of 65 km / hr takes to cross a bridge 150 m length ?
"speed = 65 * 5 / 18 = 18.1 m / sec total distance covered = 130 + 150 = 280 m . required time = 280 / 18.1 ' = 15.5 sec . answer : c"
divide(add(130, 150), multiply(65, const_0_2778))