SOLUTION: Sarah can build a fence in 9 hours. Joe can do the same in 6 hours. How long would it take them working together, to build the fence?
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Question 739666: Sarah can build a fence in 9 hours. Joe can do the same in 6 hours. How long would it take them working together, to build the fence?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/9+1/6=1/x
3/9+3/6=3/x
1/3+1/2=3/x
2+3=18/x
5/18=1/x
x=18/5
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