Answer :

[tex]v=\frac{distance}{time}=\frac{s}{t}\\\\s=9mi\\t=2h\\\\v=\frac{9mi}{2h}=\boxed{4.5\ m/h=4.5\ mph}[/tex]
AL2006
Your speed is exactly 9 miles per 2 hours.

In units that sound more familiar,  (9 miles) / (2 hours) = 4.5 miles per hour.

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