Point $A$ is located at $(0,0)$. Point $B$ is located at $(2,3)$ and is the midpoint of $AC$. Point $D$ is located at $(10,0)$. What are the coordinates of the midpoint of segment $CD$?
1. **Determine the coordinates of point \( C \)**:
   - Given that point \( B \) is the midpoint of \( AC \), we use the midpoint formula:
     \[
     B = \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right)
     \]
     where \( A = (0,0) \) and \( B = (2,3) \).
   - Let \( C = (x_2, y_2) \). Then:
     \[
     \left( \frac{0 + x_2}{2}, \frac{0 + y_2}{2} \right) = (2, 3)
     \]
   - Solving for \( x_2 \) and \( y_2 \):
     \[
     \frac{x_2}{2} = 2 \implies x_2 = 4
     \]
     \[
     \frac{y_2}{2} = 3 \implies y_2 = 6
     \]
   - Therefore, \( C = (4, 6) \).

2. **Determine the coordinates of the midpoint of segment \( CD \)**:
   - Given \( C = (4, 6) \) and \( D = (10, 0) \), we use the midpoint formula again:
     \[
     \text{Midpoint of } CD = \left( \frac{4 + 10}{2}, \frac{6 + 0}{2} \right)
     \]
   - Calculate the coordinates:
     \[
     \left( \frac{14}{2}, \frac{6}{2} \right) = (7, 3)
     \]

The final answer is \(\boxed{(7, 3)}\).