Joe can put up a swing set in 3 hours. Andy can put up a swing set in 5 hours. How long would it take Joe and Andy to put a swing set up if they worked together?

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Joe = 3 hours Andy = 5 hours If they do it together, time needed = (3 x 5) / ( 3 + 5) = 15/8 = 1 7/8 hours. Answer: 1 7/8 hour


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