Problem $1$ Gasoline flows into the cylindrical tank through two pipes. At A the velocity is $\backslash (4\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ),$ and at $\backslash ($ B $\backslash )$ it is $\backslash (6\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ Determine the rate at which the level of the gasoline is rising in the tank. The density of the gasoline can be treated as a constant $($the value of which has no effect on the final answer$).$