One side of square $ABCD$ has a length of $12$ meters. A certain rectangle whose area is equal to the area of $ABCD$ has a width of 8 meters. What is the length, in meters, of the rectangle?

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The area of the square:

$$A_{\text{square}} = s^2$$ $$= 12^2 = 144$$

The area of the rectangle is equal to the square:

$$A_{\text{rectangle}} = l\times w$$ $$144 = l(8)$$ $$l = \boxed{18}$$