A deep-dish apple pie, whose internal temperature was 220F when removed from the oven, was set out

Question:

A deep-dish apple pie, whose internal temperature 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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