SOLUTION: It takes Sam 10 hours to build a section of fence. When David helps him, they can build a section together in 3 hours. How long would it take David to build a section alone?

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Question 974965: It takes Sam 10 hours to build a section of fence. When David helps him, they can build a section together in 3 hours. How long would it take David to build a section alone?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
Their combined rate is the sum of their individual rates. SECTION per HOUR is the unit for rate.