Give the step-by-step reasoning process and then the final answer. Harvey and his friend Sam decided to run a footrace in their school track field to see who was better at running. While at it, Harvey runs 8 miles more than his friend Sam, who runs a total of 12 miles. Calculate the total number of miles the two friends run together.
If Harvey ran 8 more miles, then he ran a total of 12 miles + 8 miles = 20 miles. The two friends ran a total of 20 miles + 12 miles = 32 miles.
The final answer: 32.