ruhi saini
ruhi saini answered question
Total work is 2/5+3/5=1 so, A use to do 2/5th work ,but he has completed =2/5*1/9 = 2/45 work   II,y B  use to do 3/5th work ,but he has completed =3/5*5/18= 1/6work left out work = 1-(2/45 -1/6)= 71/90