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Problem T2.3 (8 points): At coffee house with constant temperature A = 90 F, I got a cup of coffee whose temperature was To =

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Problem T2.3 (8 points): At coffee house with constant temperature A = 90 F, I got a cup of coffee whose temperature was To = 210 F. I waited for 15 minutes, and the coffee's temperature dropped to Tis = 150"F. If I want to drink it at precisely T, = 105 F, how much longer should I wait

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