two trains 111 meters and 165 meters in length respectively are running in opposite directions , one at the rate of 40 km and the other at the rate of 50 kmph . in what time will they be completely clear of each other from the moment they meet ?
"t = ( 111 + 165 ) / ( 40 + 50 ) * 18 / 5 t = 11.04 answer : a"
divide(add(111, 165), multiply(add(40, 50), const_0_2778))