Answer :
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
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