So, we know that he ran 65 miles, and he ran one short mile of 8.2 miles. We also know that the rest of the miles are among five long runs.
1. Subtract the known data.
65 - 8.2 = 56.8
2. Divide 56.8 by 5 to determine the distance of each long run.
56.8 / 5 = 11.36
This summarizes that each long run was 11.36 miles long.