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

Question 745074: Peter and Paul can do a certain job in 3 hours. On a given day, they worked together for 1 hour then Paul left Peter finishes the rest of the work in 8 more hours. How long will it take for the son to dig the well alone?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Peter and Paul can do a certain job in 3 hours. On a given day, they worked together for 1 hour then Paul left Peter finishes the rest of the work in 8 more hours. How long will it take for the son to dig the well alone?
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peter and paul rate: 1/3 job/hour
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In one hour p and p finished 1/3 of the job; 2/3 of the job remained
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Peter rate: [(2/3)/8](job/hour) = 1/12 job/hr
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Assuming that Paul is the son:
Paul rate = (1/3)-(1/12) = 1/4 job/hr
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Paul could do the job alone in 4 hours.
Peter could do the job alone in 12 hours.
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Cheers,
Stan H.
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