FIGURE $6\mathrm{.}27$ Problems $6\mathrm{.}72$

$6\mathrm{.}72$ For the siphon shown in Fig. $6\mathrm{.}27,$ calculate $($a$)$ the volume flow rate of oil from the tank and $($b$)$ the pressures at points A$,$ B$,$ C$,$ and D$.$