SOLUTION: Peter and Paul can do a certaion job in 3 hours. On a given day, they worked together for 1 hour then Paul left and Peter finishes the rest of the work in 8 more hours. How long wi

Question 745788: Peter and Paul can do a certaion job in 3 hours. On a given day, they worked together for 1 hour then Paul left and Peter finishes the rest of the work in 8 more hours. How long will it take Peter to do the job alone?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
If they can do the whole job in 3 hrs working
together, then in 1 hour, they can do
of the job
That means there is 2/3 of the job left to do
-----------------
Then, ( Peter's rate of working ) x ( 8 hrs ) = 2/3
Let = Peter's rate of working

Peter would take 12 hrs to do the job alone
check:
----------
Let = Paul's rate of working

In hr,

So, of the job is left
Peter does

OK

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