Question

Travis buys a new deep freezer. The manual tells him the temperature will drop 12°C every hour after he plugs it in. It is currently 70°C in his house. He checks several hours later and the freezer reads -2°C. How many hours have passed?

Answer 1

It took 6 hours for Travis's deep freezer to cool down from a house temperature of 70°C to -2°C, considering it drops 12°C every hour.

Step-by-step explanation:

To determine how many hours have passed since Travis plugged in his new deep freezer, we need to consider the temperature drop per hour and calculate the total drop needed to reach -2°C from the initial temperature of 70°C. The deep freezer drops 12°C every hour. The total temperature drop is

70°C - (-2°C) = 72°C

To find the number of hours that have passed, we divide the total drop by the rate of temperature drop:

Hours passed = Total Temperature Drop ÷ Temperature Drop Per Hour

Hours passed = 72°C ÷ 12°C/hour

Hours passed = 6 hours

Therefore, it took 6 hours for the deep freezer to reach -2°C from the initial house temperature of 70°C.