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$4\mathrm{.}22$ As shown in Figure P$4\mathrm{.}22,$ water flows inside the branch pipe and the velocity distribution is uniform at the inlet and outlet. A fixed control volume at t$=20$ seconds is consistent with the system. Draw a picture of the following: $($a$)$ Boundary of the system at t$=20\mathrm{.}1$ sec $($b$)$ Fluid leaving the control volume for $0\mathrm{.}1$ sec $($c$)$ Fluid entering the control volume for $0\mathrm{.}1$ sec