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 $\;10\;mm^{2}\;$ respectively . The rate at which water flows through the tube is $\;(g=10\;ms^{-2})\;$

Question

$(a)\;7.5\;cc/s\qquad(b)\;8.0\;cc/s\qquad(c)\;10.0\;cc/s\qquad(d)\;12.5\;cc/s$