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To find the width of the rectangular prism, we can rearrange the volume formula \( V = lwh \) to solve for width \( w \).
Given:
- \( V = 90 \, \text{ft}^3 \)
- \( l = 3 \, \text{ft} \)
- \( h = 12 \, \text{ft} \)
We can plug in the values into the formula and solve for \( w \):
\[
90 = 3 \times w \times 12
\]
Calculating the product of length and height:
\[
90 = 36w
\]
Now, we can solve for \( w \) by dividing both sides by 36:
\[
w = \frac{90}{36}
\]
Calculating the fraction:
\[
w = 2.5
\]
Thus, the width of the rectangular prism is \( \boxed{2.5} \) ft.