SOLUTION: if lisa were to paint her living room alone, it would take 2 hours. Her sister Marie could do the job in 5 hours. How long would it take them working together?

SOLUTION: if lisa were to paint her living room alone, it would take 2 hours. Her sister Marie could do the job in 5 hours. How long would it take them working together?

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Question 838010: if lisa were to paint her living room alone, it would take 2 hours. Her sister Marie could do the job in 5 hours. How long would it take them working together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/2+1/5=1/x
5/10+2/10=1/x
7/10=1/x
10/7=x

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