Answer: 80 miles.
Explanation:
1. You have the following information given in the problem above:
- Carter ran 48 miles.
- 48 miles was 60% of Carter's goal.
2. Then, to calculate the number of miles that Carter set at his goal, you need to divide 48 miles by 60 and multiply this by 100, as following:

3. Therefore, the answer is 80 miles.