If the lines $\frac{x - 1}{-3} = \frac{y - 2}{2k} = \frac{z - 3}{2}$ and $\frac{x - 1}{3k} = \frac{y - 5}{1} = \frac{z - 6}{-5}$ are perpendicular to each other,then $k = \dots$
- A$\frac{5}{7}$
- B$\frac{7}{5}$
- C$\frac{-7}{10}$
- D$\frac{-10}{7}$
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