one day at 3 a.m. the temperature was -13 in Klondike Alaska at 10 am it was 22 degrees . what was the average change in temperature per hour

The average change of temperature per hour is the difference in temperature divided by the difference in hours.

3 a.m.     10 a.m.  ----> difference in time: 10 - 3 = 7
-13           22         ----> difference in temperature: 22 - (-13) = 35

average change of temperature per hour: 35/7 = 5

Answer: 5 degrees per hour