One day at 3: 00 a. m., the temperture was -13 degrees f in kodiak ,alaska. at 10: 00 a. m. the temperature was 22 degrees f. what was the average change in temperature per hour?

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture