.
Let x be the distance to Horseshoe Lake, in miles.
Then the length of the Crystal palace tour is (2x-0.5) miles, according to the condition.
The condition also says that the sum of two lengths is 3.25 miles, or
x + (2x-0.5) = 3.25.
3x -0.5 = 3.25
3x = 3.25 + 0.5 = 3.75 ====> x =
= 1.25.
Thus the distance to Horseshoe Lake is 1.25 miles, and the Crystal palace tour is 2*1.25 - 0.5 = 2 miles long.
Solved.