how long does a train 110 m long travelling at 60 kmph takes to cross a bridge of 170 m in length ?
"d 16.8 sec d = 110 + 170 = 280 m s = 60 * 5 / 18 = 50 / 3 t = 280 * 3 / 50 = 16.8 sec"
divide(add(110, 170), multiply(60, const_0_2778))