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According to Newton's law of cooling, the rate at which a body cools is proportional to the difference in temperature between it and the surrounding

According to Newton's law of cooling, the rate at which a body cools is proportional to the difference in temperature between it and the surrounding medium. Assuming Newton's law holds, how long will it take a cup of hot water, initially at 191F, to cool to 100F if the room temp is 70F, if it cools to 129F in 4 min? It will take about minutes. (Round to two decimal places as needed.)

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