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330 m/s also means [tex]\dfrac{330 \text{ m}}{1 \text{ s}}[/tex], which is the same as [tex]\dfrac{1 \text{ s}}{330 \text{ m}}[/tex].
If you take that last version and multiply it by 80 m:
[tex]80 \text{ m} \cdot \dfrac{{1 \text{ s}}}{330 \text{ m}} = \dfrac{80}{330} \text{ s}[/tex]
80/330 ≈ 0.2424...