The parallelogram shown represents a map of the boundaries of a natural preserve. walking trails run from points a to c and from points b to d. the measurements shown represent miles.

parallelogram a b c d is shown. diagonals are drawn from point a to point c and from point d to point b and intersect at point e. the length of d e is y + 2, the length of e b is 3 y minus 4, and the length of e c is 2 y minus 3.

what is the sum of the lengths of the two trails?

6 miles
12 miles
16 miles
36 miles