The area of the park is 6.25 square kilometers
Let's call the width of the park "w" kilometers. Since the park is 4 times as long as it is wide, its length is "4w" kilometers.
The distance around the park is the sum of the two lengths and two widths: 2w + 4w = 6w. We know this distance is also 12.5 kilometers: 6w = 12.5 kilometers.
Solving for w, we get: w = 12.5 kilometers / 6 = 1.25 kilometers.
Therefore, the length of the park is 4 * 1.25 kilometers = 5 kilometers.
Now, we can calculate the area of the park: area = length * width = 5 kilometers * 1.25 kilometers = 6.25 square kilometers.
So, the area of the park is 6.25 square kilometers.