Answer
$r = 1.4\times 10^{10}~ly$
Work Step by Step
We can find the distance where $v=c$:
$v = Hr$
$r = \frac{v}{H}$
$r = \frac{3.0\times 10^8~m/s}{0.0218~m/s~ly}$
$r = 1.4\times 10^{10}~ly$
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