3. At 2:00 pm a thermometer reading 80° F is taken outside where the air temperature is 20 ° F. At 2:03 pm the temperature reading yielded by the thermometer is 42 ° F. Later the thermometer is brought inside where the air is at 80° F. At 2:10 pm the reading is 71° F. When was the thermometer brought indoors?

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