6. According to Newton?s Law of Cooling, the rate at which a substance cools in air is directly proportional to the difference between the temperature of the substance and that of air. If the temperature of the air is 30° and the substance cools from 100° to 70° in 15 minutes, approximately, how long will it take to cool 100° to 50°? (a) 33.58 minutes (b) 43.50 minutes (c) 35.39 minutes (d) 45.30 minutes

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