hello
to solve this question, we need to familiarize ourselves with basic unit conversions.
[tex]1\text{miles}=5280ft[/tex][tex]\begin{gathered} 1\text{hour}=3600s \\ \text{note: 1 hr = 60mins } \\ 1\min =60\sec \\ \text{cross multiply and you'll get } \\ 1hr=60\times60=3600\sec \end{gathered}[/tex]If 1 miles = 5280ft, how many feet would be in 40 miles
[tex]\begin{gathered} 1miles=5280ft \\ 40\text{miles}=\text{ x ft} \\ \text{cross multiply and make x the subject} \\ x=\frac{40\times5280}{1} \\ x=211,200ft \end{gathered}[/tex]so, now we have 211,200ft/3600s
we can simply divide both to get our answer in ft/s
[tex]\begin{gathered} \frac{ft}{s}=\frac{211200}{3600} \\ 58.67\text{ ft/s} \end{gathered}[/tex]the kangaroo's speed is 58.67ft/s
