Mr. Zorn had skated total 17 miles.
<u><em>Explanation</em></u>
The length of the exercise trail around the Westwood park is 3 miles.
Mr. Zorn is skating around the trail 5 and 1/2 times.
So, the distance skated in 5 times 
and the distance skated in
of the trail 
Thus, the total distance he had skated will be:
<em>(Rounded to the nearest mile)</em>