IB MAI HL Geometry & Trigonometry Topic 3.6 Vectors (id: e3cdf8313)

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, disttqado+ bx u;1/9yro f-ancki+ue *c 9u w/lo)i ds6w+rmvp)3y9cres are measured in kilometres.
Two tankers, A and B, are observed from an origin O. Relative to O, their position vectors at time t hours after 6:00pm are given by
$\begin{array}{l}{\mathbf{r}}_{\mathrm{A}}=\left(\begin{array}{c}1\\ 1\end{array}\right)+t\left(\begin{array}{c}7\\ 4\end{array}\right)\\ {\mathbf{r}}_{\mathrm{B}}=\left(\begin{array}{c}6\\ 9\end{array}\right)+t\left(\begin{array}{c}5\\ 3\end{array}\right)\end{array}$
Find the time when the distance between the two tankers is at a minimum.

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