Correct. The pool will have $\displaystyle{2}{x}\usepackage{cmbright}\Huge\$ gallons in $\displaystyle{x}\usepackage{cmbright}\Huge\$ minutes, so it will take 25 minutes to fill the pool (if $\displaystyle{2}{x}={50}\usepackage{cmbright}\Huge\$ , then $\displaystyle{x}=\frac{{{50}}}{{{2}}}={25}.\usepackage{cmbright}\Huge\$ )