50 points pls help! Mike, Joe, and Bill are painting a fence. The painting can be finished if Mike and Joe work together for 4 hours and Bill works alone for 2 hours, or if Mike and joe work together for 2 hours and Bill works alone for 5 hours, or if Mike works alone for 6 hours, Joe works alone for 2 hours and bill works alone for 1 hour. How much time does it take each man working alone to complete the painting?

pls help I've asked multiple times to no avail