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Delbert can paint the fence in 11 hours so in 1 hour Delbert paints 1/11 of a fence.

Similarly, in 1 hour Dorothy paints 1/12 of a fence.

So together, in 1 hour they paint 1/11 + 1/12 = 12/132 + 11/132 = 23/132 of a fence.

So to paint the fence together they would need 1 / (23/132) = 132/23 hours = 5.74 hours

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โˆ™ 2009-09-27 13:32:11
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Q: Delbert can paint a fence by himself in 11 hours and Dorothy can paint the same fence in 12 hours How long will it take them to paint the fence if they work together?
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