Answer
$\frac{25\pi}{6}~m$
Work Step by Step
First, since $250^o= 250\times\frac{\pi}{180} \ rad=\frac{25\pi}{18} rad$, then using the relation $s=r\theta$, we have
$$
s=r\theta=3\times \frac{25\pi}{18}=\frac{25\pi}{6}~m
.$$
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