At midnight, with the temperature inside your house at 70 degrees and the temperature outside at 20 degrees, your furnace breaks down. Two hours later, the temperature in your house has fallen to 50 degrees. Assume that the outside temperature remains constant at 20 degrees. At what time, to the nearest minute, will the
inside temperature of your house reach 40 degrees? Use Newton's law of cooling formula below. (Hint: Find k to
4 decimal place first)
