Given:-
If a person travels 3.5 miles in 30 minutes.
To find their speed in miles per hour.
So now we solve using the formula,
[tex]\text{Distance}=\text{speed}\times time[/tex]Substituting the known values. we get,
[tex]3.5=\text{Speed}\times\frac{1}{2}[/tex]Now we solve for speed. so we get,
[tex]\begin{gathered} \text{speed}=3.5\times2 \\ \text{speed}=7 \end{gathered}[/tex]So the required speed is 7miles/hr.