To find out how many miles each runner runs during the relay race, you need to divide the total distance of the race by the number of runners.
The total distance of the relay race is 15.75 miles, and there are 5 runners:
\[ \text{Distance each runner runs} = \frac{15.75 \text{ miles}}{5 \text{ runners}} = 3.15 \text{ miles} \]
So, each team member runs 3.15 miles during the race.