Suppose that a cup of soup cooled from 90 degrees C to 70 degrees C after 20 minutes in a room whose temperature was 20 degrees 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 degree C?
(B) Instead of being left to stand in the room, the cup of 90 degree C soup is put in the freezer whose temperature is - 15 degree C. How long will it take the soup to cool from 90 degree C to 30 degree C?
