$$\left. \begin{array} { l } { \quad V = 5.5 \sqrt { 0.6 t + \frac { P } { 100 } } } \end{array} \right.$$
$t\in \mathrm{R}$
$V=\frac{11\sqrt{60t+P}}{20}$
$P\in \mathrm{R}$
