In the diagram shown, the difference in the two tubes of the manometer is 5 cm, the cross section of the tube at A and B is 6 mm^2 and 10 mm^2…

In the diagram shown, the difference in the two tubes of the manometer is $\displaystyle 5$ cm, the cross section of the tube at A and B is $\displaystyle 6 \mathrm{~mm}^2$ and $\displaystyle 10 \mathrm{~mm}^2$ respectively. The rate at which water flows through the tube is $\displaystyle \left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)$