how long does a train 120 m long travelling at 60 kmph takes to cross a bridge of 170 m in length ?
"e 17.4 sec d = 120 + 170 = 290 m s = 60 * 5 / 18 = 50 / 3 t = 290 * 3 / 50 = 17.4 sec answer is e"
divide(add(120, 170), multiply(60, const_0_2778))