The rate at which a substance cools in moving air is proportional to the difference between the temperatures of the substance and that of the air. If the temperature of the air is 290 K and the substance cools from 370 K to 330K in 10 minutes, when will the temperature be 295 K? (1) 20 minutes (2) 30 minutes (3) 40 minutes (4) 50 minutes

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