VectorsVectors (id: ff809afcc)

本题目来源于试卷: VectorsVectors，类别为 IB数学

[填空题]
In this question, distanc in 3neb :hc*w9:jgm) ,w.o risma8/spes6ck oz:1 +encb 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}}=\binom{1}{1}+t\binom{7}{4} \\
\mathbf{r}_{\mathrm{B}}=\binom{6}{9}+t\binom{5}{3}
\end{array}
$

Find the time when the distance between the two tankers is at a minimum. a : b pm a =    b =   

参考答案:
空格1: 9  空格2: 36 


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