SOLUTION: It takes Joan 5 h to paint the porch, while Jan can do it in 4 h. How long will it take them working together?

SOLUTION: It takes Joan 5 h to paint the porch, while Jan can do it in 4 h. How long will it take them working together?

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Question 482332: It takes Joan 5 h to paint the porch, while Jan can do it in 4 h. How long will it take them working together?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
1/5+1/4=1/t
4/20+5/20=1/t
9/20=1/t
9t=20
t=20/9 hours working together..
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