Question: A thermometer, reading 5C, is brought into a room whose temperature is 22C. One minute later the thermometer reading is 12C. How long does it

A thermometer, reading 5°C, is brought into a room whose temperature is 22°C. One minute later the thermometer reading is 12°C. How long does it take until the reading is practically 22°C, say, 21.9°C?

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