Solution:
Given:
[tex]\begin{gathered} \text{time, t = 9hours} \\ dis\tan ce,\text{ d=460.8miles} \end{gathered}[/tex]The formula for calculating speed is given by;
[tex]\text{speed}=\frac{distance}{\text{time}}[/tex]Substituting the given data into the formula,
[tex]\begin{gathered} \text{speed}=\frac{distance}{\text{time}} \\ \text{speed}=\frac{460.8}{9} \\ \text{speed}=51.2\text{miles per hour} \end{gathered}[/tex]Therefore, Elsa's speed was 51.2 miles per hour