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?

Algebra ->  Rate-of-work-word-problems -> 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?      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
Isabella: 1%2F7 job per hours
Matthew: 3%2F7


Together:
1%2F7%2B3%2F7

4%2F7, JOBS%2FHOURS

To find the time for 1 job,
7%2F4
highlight%281%263%2F4%29hours