If you would like to know how many miles did Pablo run, you can calculate this using the following steps:
5 4/8 miles on Friday + 6 5/8 miles on Saturday + 7 4/8 miles on Sunday = 5 4/8 + 6 5/8 + 7 4/8 = 44/8 + 53/8 + 60/8 = 157/8 = 19 5/8 miles
The correct result would be D. 19 5/8 miles.