5. (6 points) There is a wall clock that strikes once at every hour, and it strikes as many times as the hour. At four o'clock, the clock takes 12 seconds to finish striking; then at twelve o'clock, it will take $\qquad$ seconds to finish striking.
【Solution】Solve: $12 \div(4-1) \times(12-1)$
$$
\begin{array}{l}
=12 \div 3 \times 11 \\
=44 \ (\text{seconds})
\end{array}
$$

Answer: It takes 44 seconds to strike twelve.
Therefore, the answer is: 44.