Pablo ran a distance of 9 1/2 miles during his first week of training for a marathon. Then he ran a distance of 10 3/8 miles during his second week of training. What was the total distance that Pablo ran during both weeks?

To add the distances together, we need to find a common denominator for the fractions. The least common multiple of 2 and 8 is 8. The equivalent fraction of 1/2 with a denominator of 8 is 4/8. The sum of 9 1/2 and 10 3/8 is 9 4/8 + 10 3/8=19 7/8 = <<19+7/8=19.875>>19.875 miles. Answer: \boxed{19.875}.

To find the total distance that Pablo ran during both weeks, you need to add the distances he ran in each week.

First Week: 9 1/2 miles
Second Week: 10 3/8 miles

To add these fractions, you need to find a common denominator. In this case, the common denominator is 8.

Converting 1/2 to eighths: (1/2) * (4/4) = 4/8
Converting 3/8 to eighths: (3/8)

Now adding the fractions:

9 4/8 + 10 3/8 = 19 7/8

Therefore, the total distance that Pablo ran during both weeks is 19 7/8 miles.