how long does a train 110 m long traveling at 36 kmph takes to cross a bridge of 170 m in length ?
"d = 110 + 170 = 280 m s = 36 * 5 / 18 = 10 t = 280 * 1 / 10 = 28 sec answer : a"
divide(add(110, 170), multiply(36, const_0_2778))