Question

In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to -54 at an average rate of-12 degrees Fahrenheit per hour. Over how many hours does the change take place

Answer 1

8 hours

Explanation:

The time required is the temperature difference divided by the rate of change of temperature:

(-54 -42)°F/(-12 °F/h) = -96/-12 h = 8 h