how long does a train 90 m long traveling at 60 kmph takes to cross a bridge of 170 m in length ?
"d = 90 + 170 = 260 m s = 60 * 5 / 18 = 50 / 3 t = 260 * 3 / 50 = 15.6 sec answer : d"
divide(add(90, 170), multiply(60, const_0_2778))