Answer
$10\pi\,ft\approx31.4\,ft$
Work Step by Step
Radius $r=5\,ft$
Angular velocity $\omega=0.5\,rpm=0.5\times2\pi\,rad/min=\pi\,rad/min$
Linear velocity $v=r\omega=5\,ft\times\pi\,rad/min=5\pi\,ft/min$
Distance $d=v\times t=5\pi\,ft/min\times2\,min=10\pi\,ft$
$\approx31.4\,ft$