SOLUTION: Solve: By himself, Tim can complete his paper route in 80 minutes. With the help of Sue it takes 50 minutes. HOw many minutes would it take Sue to do the route by herself? Could

Algebra ->  Expressions-with-variables -> SOLUTION: Solve: By himself, Tim can complete his paper route in 80 minutes. With the help of Sue it takes 50 minutes. HOw many minutes would it take Sue to do the route by herself? Could      Log On


   

Question 399920: Solve: By himself, Tim can complete his paper route in 80 minutes. With the help of Sue it takes 50 minutes. HOw many minutes would it take Sue to do the route by herself?
Could you please explain step by step how you got this problem so I can understand more problems like this when I see them?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
rate of Tim = 1/80
rate of Sue = 1/s
Then 50%281%2F80+%2B+1%2Fs%29+=+1
==> 1%2F80+%2B+1%2Fs+=+1%2F50
==> 1%2Fs+=+3%2F400
==> s+=+400%2F3+=+133%261%2F3 minutes.