\[ -a y(x)^s-b x^{\frac {r s}{r-s}}+y'(x)^r=0 \] ✗ Mathematica : cpu = 3600.76 (sec), leaf count = 0 , timed out
$Aborted
✓ Maple : cpu = 0.284 (sec), leaf count = 61
\[ \left \{ -\int _{{\it \_b}}^{y \left ( x \right ) }\! \left ( x \left ( r-s \right ) \sqrt [r]{a{{\it \_a}}^{s}+b{x}^{{\frac {rs}{r-s}}}}-r{\it \_a} \right ) ^{-1}\,{\rm d}{\it \_a} \left ( r-s \right ) +\ln \left ( x \right ) -{\it \_C1}=0 \right \} \]