A deep-dish apple pie, whose internal tempera-ture was 220°F when removed from the oven, was set out on a breezy 40°F porch to cool. Fifteen minutes later, the pie’s internal temperature was 180°F. How long did it take the pie to cool from there to 70°F?

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter48: Applications Of Formulas To Spur Gears
Section: Chapter Questions
Problem 69A
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A deep-dish apple pie, whose internal tempera-ture was 220°F when removed from the oven, was set out on a breezy 40°F porch to cool. Fifteen minutes later, the pie’s internal temperature was 180°F. How long did it take the pie to cool from there to 70°F?

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