The unit rate of 15 degrees in 2 hours. It says here that in 2 hours, there are 15 degrees. So we need to find the unit rate of this given situation per hours. There are 2 hours so you'll divide 2 by 15 to get the unit rate of the given situation 15 divided by two is 7.5 So the unit rate would be 7.5 degrees per hour.