We solve for \( r \) and \( q \) using the absolute value equations:
\[
r - 6 = \pm 11 \quad \Rightarrow \quad r = 17 \text{ or } r = -5
\]
\[
2q - 12 = \pm 8 \quad \Rightarrow \quad q = 10 \text{ or } q = 2
\]
Now, we calculate \( q / r \) for each possible pair of \( q \) and \( r \), and find the minimum value to be \( -2/5 \).