Joe and Skyler can clean an entire building in 44 hours. Joe can clean the entire building by himself in 66 fewer hours than Skyler can. How long does it take Joe to clean the building by​ himself?

Answer 1

look at the solution both Damon and I gave here for a similar question

http://www.jiskha.com/display.cgi?id=1487716112

The only difference is that here you are given the combined rate.