Answer
$\frac{21}{40} \ \text{mi} ^2$.
Work Step by Step
The area is computed by $A = a \cdot b$.
Here, we substitute $a = \frac{7}{5}$ and $b=\frac{3}{8} $. From this it follows that the area $A$ is computed by:
$A = a \cdot b = \frac{7}{5} \cdot \frac{3}{8} = \frac{7 \cdot 3}{5 \cdot 8} = \frac{21}{40}$.
With considering the unit, the answer is $\frac{21}{40} \ \text{mi} ^2$.
