In the figure, triangles $△LMN$ and $△OPQ$ are similar with $\angle M=\angle Q=90^{\circ }$ and corresponding vertices $L\leftrightarrow O$, $M\leftrightarrow Q$, $N\leftrightarrow P$. In $△LMN$, $LM=17$, $MN=8$, $LN=15$. In $△OPQ$, $OP=10$ and $OQ=12$. What is the length of $PQ$?