Let's start by using the formula:
distance = rate x time
Let d be the distance the boat traveled, in miles.
The time it took Pat and Jeff to walk to the dock is the same as the time it took them to motor to Dillon, so we can write:
d/8 = (13 - d)/2
Simplifying this equation, we get:
d = 8(13 - d)/2
d = 52 - 4d
5d = 52
d = 10.4
Therefore, the boat traveled a distance of 10.4 miles.