We know that 1 mile = 1.6 km, so we can set up a proportion:
$\frac{12 \text{ km}}{1 \text{ L}} \times \frac{1 \text{ mile}}{1.6 \text{ km}}$
The km units cancel out, leaving us with:
$\frac{12 \text{ miles}}{1.6 \text{ L}}$
Now, we need to convert this to
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