Water flows through a horizontal tube as shown in the figure. The difference in height between the water columns in vertical tubes is 5 cm and the…

Water flows through a horizontal tube as shown in the figure. The difference in height between the water columns in vertical tubes is $\displaystyle 5$ cm and the area of cross-sections at $\displaystyle A$ and $\displaystyle B$ are $\displaystyle 6 \mathrm{~cm}^2$ and $\displaystyle 3 \mathrm{~cm}^2$ respectively. The rate of flow will be $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{cm}^3 / \mathrm{s}$. (take $\displaystyle g=10 \mathrm{~m} / \mathrm{s}^2$ )