Suppose that a cup of soup cooled from 90°C to 40°C after 15 minutes in a room whose temperature was 20°C. Use Newton's law of cooling to answer the following questions. a. How much longer would it take the soup to cool to 30°C? b. Instead of being left to stand in the room, the cup of 90°C soup is put in the freezer whose temperature is -20°C. How long will it take the soup to cool from 90°C to 30°C?

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