Mr. Zorn had skated total 17 miles.
Explanation
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 [tex]= (3* 5) miles = 15 miles[/tex]
and the distance skated in [tex]\frac{1}{2}[/tex] of the trail [tex]= (3* \frac{1}{2})miles = 1.5 miles[/tex]
Thus, the total distance he had skated will be: [tex](15+1.5) miles = 16.5 miles \approx 17 miles[/tex] (Rounded to the nearest mile)