# SOLUTION: There are 480 dishes that need to be rinsed. John can rinse them in 80 minutes by himself. It will take his friend Bob 120 minutes to rinse these dishes. How long will it take them

Algebra ->  Algebra  -> Proportions -> SOLUTION: There are 480 dishes that need to be rinsed. John can rinse them in 80 minutes by himself. It will take his friend Bob 120 minutes to rinse these dishes. How long will it take them      Log On

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 Click here to see ALL problems on Proportions Question 279995: There are 480 dishes that need to be rinsed. John can rinse them in 80 minutes by himself. It will take his friend Bob 120 minutes to rinse these dishes. How long will it take them if they rinse these 480 dishes together? Answer by checkley77(12569)   (Show Source): You can put this solution on YOUR website!1/80+1/120=1/x (120+80)/80*120=1/x 200/9,600=1/x cross multiply 200x=9,600 x=9,600/200 x=48 minutes working together.