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Peter and Pippin are peeling pails of potatoes. The two pails contain the same number of identical potatoes, and they begin peeling at the same time, working at constant rates. A half hour later Peter has just completed his pail, while Pippin is only two-thirds of the way through his pail. If Peter immediately joins Pippin, then how long will it take, in minutes, for the two of them to polish off peeling the rest of Pippin's potatoes?

 Oct 22, 2020
edited by Guest  Oct 22, 2020
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the job remaining is 1/3 pail of potatoes

Pippin will require  50% more time to go from 2/3 to  3/3    or  15 minutes

Peter by himself could do the 1/3 pail  in 10 minutes

 

1/10 + 1/15 = 1/x     solve for x = 6 minutes

 Oct 22, 2020

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