A hot pie is taken directly from an oven and placed outdoors on a porch table to cool on a day when the surrounding outdoor temperature is a constant 80° F. The temperature of the pie was 350° F at the instant when it was placed on the table, and it was 310° F 5 minutes later. When (in minutes) was its temperature 115° F? Noto: Innut numerical values only do not tyne the units space or comma

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