Answer
Each side measures $2x^5-8x^3+0.5$ miles.
Work Step by Step
The perimeter of a polygon is equal to the sum of the lengths of its sides,
A regular hexagon has 6 equal sides.
Having a perimeter of $12x^5-48x^3+3$ means that it is the sum of the six equal sides.
Thus, to find the length of each side of the regular hexagon, divide the perimeter by 6 to have:
$=\dfrac{12x^5-48x^3+3}{6}
\\=2x^5-8x^3+0.5$
