Problem $2.$ The figure shows a tank within a tank, each containing air. The absolute pressure in $tankA$ is $316\mathrm{.}4$ kPa $.$ Pressure gage A is located inside tank B and reads $153\mathrm{.}6$ kPa $.$ The U$-$tube manometer connected to tank B contains mercury with a density of $13\mathrm{.}589\frac{g}{c}{m}^3.$ The atmospheric pressure surrounding tank B is $109\mathrm{.}7$ kPa and the acceleration of gravity is $g=9\mathrm{.}86\frac{m}{s^2}.$ Using this information, determine $($a$)$ the absolute pressure inside tank $B,$ in kPa $,$ and $($b$)$ the column length L $,$ in cm $.$