SOLUTION: Marge could clean the house in 5 hours. Lisa could clean it in 3 hours. How long will it take the both of them to clean the house?

Question 860845: Marge could clean the house in 5 hours.
Lisa could clean it in 3 hours.
How long will it take the both of them to clean the house?
Answer by ben720(159) (Show Source): You can put this solution on YOUR website!
Marge's rate is 1 job/5 hours
Lisa's rate is 1 job/ 3 hours
Together their rate is 1/5+1/3

Find the least common denominator, which is 15

Together, it will take them of an hour.
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