Respuesta :

We know that the speed has units of distans over the time so the speed (S) will be:

[tex]S=\frac{\frac{21}{4}}{\frac{1}{2}}[/tex]

and simplify this:

[tex]S=\frac{42}{4}=\frac{21}{4}[/tex]

so the speed is 21/4 miles per hour

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