12. (5 points) Person A and Person B start from points $A$ and $B$ respectively at the same time, heading towards each other. It is known that the speed ratio of A and B is 6:5, and they meet 5 kilometers away from the midpoint of $A$ and $B$. When A reaches point $B$, B is still $\qquad$ kilometers away from point $A$.
【Solution】Solution: (1) Consider the entire journey as 11 parts, the distance of 1 part is:
$$
\begin{array}{l}
5 \div[6-(6+5) \div 2], \\
=5 \div[6-5.5], \\
=5 \div 0.5, \\
=10 \text { (km); }
\end{array}
$$
(2) The distance from B to point A is still:
$$
\begin{array}{l}
10 \times 6-10 \times\left(5 \div \frac{6}{5}\right), \\
=60-10 \times \frac{25}{6}, \\
=60-\frac{125}{3}, \\
=\frac{55}{3} \text { (km). }
\end{array}
$$

Answer: B is still $\frac{55}{3}$ km away from point A.
Therefore, the answer is: $\frac{55}{3}$.