本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.6 Vectors，类别为 IB数学
[问答题]
In this question, dis+vdnzjs +/-* n vbxme0l5 zw7wr8mqz9 gghq 6j 5kyr6 eoo(38vtances are measured in kilometres.
Two boats, $\mathrm{A} and \mathrm{B}$ , are observed from an origin $\mathrm{O} . Relative to \mathrm{O} $, their position vectors at time t hours after midday are given by
$\begin{array}{l}
\mathbf{r}_{\mathrm{A}}=\left(\begin{array}{c}
-4 \\
3
\end{array}\right)+t\left(\begin{array}{l}
4 \\
3
\end{array}\right) \\
\mathbf{r}_{\mathrm{B}}=\left(\begin{array}{c}
-2 \\
9
\end{array}\right)+t\left(\begin{array}{l}
5 \\
0
\end{array}\right)
\end{array}$
Find the minimum distance between the two boats.
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