Answer
$ 35\bar{0}\ m$
Work Step by Step
Using the Pythagorean Theorem, we have:
$${a}^2+{b}^2 = {c}^2.$$
Then
$$
b = \sqrt{c^2-a^2}= \sqrt{404^2-202^2}=349.87\ m \approx 35\bar{0}\ m
.$$
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