Right angle triangle $PQR$, right angled at $Q$ has length $PQ$ as 8 feet, and $PR=17\;feet$. What is the length of $QR$ ?

Question

$\begin{array}{1 1} (a)\; 12 \\ (b)\; 13 \\ (c)\;14 \\ (d)\;15 \end{array}$