$$\frac{ 2 { r }^{ 2 } }{ rs- { s }^{ 2 } } \times \frac{ 5r-5s }{ 2r-4 { r }^{ 2 } }$$
$\frac{5r}{s-2rs}$
$$\frac{2r^{2}\left(5r-5s\right)}{\left(rs-s^{2}\right)\left(2r-4r^{2}\right)}$$
$$\frac{2\times 5\left(r-s\right)r^{2}}{2rs\left(-2r+1\right)\left(r-s\right)}$$
$$\frac{5r}{s\left(-2r+1\right)}$$
$$\frac{5r}{-2rs+s}$$
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$-\frac{5r}{s\left(2r-1\right)}$
