Please help Points Q and R are midpoints of the sides of triangle ABC.

Triangle A B C is cut by line segment Q R. Point Q is the midpoint of side A B and point R is the midpoint of side A C. The lengths of A Q and Q B are 4 p, the length of Q R is 2 p + 3, and the length of C B is 6 p minus 4. The lengths of A R and R C are congruent.

What is AQ?

10 units
14 units
20 units
32 units