how long does a train 110 m long travelling at 60 kmph takes to cross a bridge of 200 m in length ?
"a 18.6 sec d = 110 + 200 = 310 m s = 60 * 5 / 18 = 50 / 3 t = 310 * 3 / 50 = 18.6 sec answer is a"
divide(add(110, 200), multiply(60, const_0_2778))