SOLUTION: It takes 7 hours for Isabella to rake leaves by herself, but her brother Matthew can work three times as fast. If they work together, how long will it take them to rake leaves?

Question 1076954: It takes 7 hours for Isabella to rake leaves by herself, but her brother Matthew can work three times as fast. If they work together, how long will it take them to rake leaves?
Answer by josgarithmetic(39621) (Show Source): You can put this solution on YOUR website!
Isabella: job per hours
Matthew:

Together:

,

To find the time for 1 job,

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