In a food processing $($drying$)$ application, air $(=1\mathrm{.}10$ kg$/$m$3,$ V $=12$ ft$/$min$)$ enters a chamber through a duct with dimensions of $21$ in$.19$ in$.$ and leaves $(=1\mathrm{.}10$ kg$/$m$3)$ through a duct with dimensions of $12$ in$.16$ in$.$ What is the average air speed in the exit duct? Express your answer in ft$/$min and m$/$s$.$