Water at $50$oC flows steadily through a tank shown in the figure below. At section $1,$ D$1=45$ cm$,$ and the volume flow is $25$ m$3/$h$.$ At section $2,$ D$2=15$ cm and the average velocity is $6\mathrm{.}14$ m$/$s$.$ If D$3=700$mm$,$ what is:

a$)(4$ points$)$ the mass flow rate through section $3$ in kg$/$min$?$

b$)(2$ points$)$ the average velocity through section $3$ in m$/$s$?$

c$)(3$ points$)$ Is the flow in or out of the tank at section $3?$