Question 824717
2/5+2/6=(12+10)/30=22/30=11/15

1/5+1/6=1/x
6/30+5/30 =1/x
11/30=1/x
30/11=x
They can paint the whole room in 30/11(2 9/11 almost 3) hours In 2 hours, they finish 11/15 (almost 2/3) of the room.