Answer
$27.9\ mi$
Work Step by Step
Using the Pythagorean Theorem, we have:
$${a}^2+{b}^2 = {c}^2.$$
Then
$$
c = \sqrt{a^2+b^2}= \sqrt{20.2^2+19.3^2}=27.937\ mi \approx 27.9\ mi
.$$
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