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?
+678 Hint: if peter can peel two-thirds of his pail in half an hour, it takes 45 minutes for him to peel a whole pail. The formula is \(\text {work load = time} \times \text{speed}\) (of course it's Pippin and Peter's speed combined).
