$6\mathrm{.}4)$ In a constant head permeability test in the Laboratory, the following are given: $L=250$ mm and $A=105cm2.$ If the value of $k=0\mathrm{.}014c\frac{m}{s}$ and a flow rate of $120cm\frac{3}{m}m$ must be maintained through the soil what id the head difference, h across the specimen? Also, determine the discharge velocity under the new conditions.