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Solve the problem.
-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 for each man working alone to complete the Painting?
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