Water $)=(62\mathrm{.}4l\frac{b}{f}{t}^3$ flows in a pipe. If the manometer connected as in Fig. is used with mercury as the fluid $)$ and $h$ is $5$ inches when the level $B$ is $15$ inches above the centerline of the pipe, what is the absolute pressure in the pipe?

$($Ans: $17\mathrm{.}7$ psia$)$