how long does a train 110 m long traveling at 60 kmph takes to cross a bridge of 140 m in length ?
"d = 110 + 140 = 250 m s = 60 * 5 / 18 = 50 / 3 t = 250 * 3 / 50 = 15 sec answer : c"
divide(add(110, 140), multiply(60, const_0_2778))