\[\frac{60m^{6}n^{5}}{17p^{4}}\ :\left( 15m^{8}n^{10} \right) =\]
\[= \frac{60m^{6}n^{5}}{17p^{4} \cdot 15m^{8}n^{10}} = \frac{4}{17p^{4}m²\ n^{5}}\]