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At 1 p.m., a thermometer reading 80°F is taken outside where the temperature is constant. At...

At 1 p.m., a thermometer reading 80°F is taken outside where the temperature is constant. At 1:05 p.m., the thermometer reads 35° F more than the surrounding temperature. Forty minutes after being taken outside, the thermometer reading differs from the outside temperature by 15° F. Determine the outside temperature. How long will it take for the same thermometer to cool from 100° F to 60° F in air, which is maintained at 50° F? Ans.: 40.5° F, 66.5 min

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