Given:
length of the rectangle = 4 km
width = 2.5 km.
Converting both measures to mi:
[tex]\begin{gathered} 4km\times\frac{1mi}{1.61km}=2.48548mi \\ \\ 2.5km\times\frac{1mi}{1.61km}=1.55343mi \end{gathered}[/tex]Area:
[tex]2.48548\times1.55343=3.86mi^2[/tex]ANSWER
Area = 3.86 mi²