Given information:
Distance;
[tex]s=40\text{ yards}[/tex]Speed;
[tex]v=8.8\text{ yards per second}[/tex]The speed is given as,
[tex]v=\frac{s}{t}[/tex]Here, t is time.
The expression for the time is,
[tex]t=\frac{s}{v}[/tex]Substituting all known values,
[tex]\begin{gathered} t=\frac{40\text{ yard}}{8.8\text{ yards per second}} \\ \approx4.55\text{ s} \end{gathered}[/tex]Therefore, the average time of running back for the 40-yard dash is 4.55 s.
