Problem 5:

An object with initial temperature 150ıC is placed outside, where the temperature is 35ıC. Its temperatures at 12:15 and 12:20 are 120ıC and 90ıC, respectively. (a) At what time was the object placed outside? (b) When Will its temperature be 40ıC?

Problem 7:

A Cup of boiling water is placed outside at 1:00 PM. One minute later the temperature of the water is 152ıF. After another minute its temperature is 112ıF. What is the outside temperature?