A viscous oil with a specific gravity (S G=0.85) and a viscosity of (0.10 mathrm{~Pa} cdot mathrm{s})

Question:

A viscous oil with a specific gravity $S G=0.85$ and a viscosity of $0.10 \mathrm{~Pa} \cdot \mathrm{s}$ flows from tank $A$ to $\operatorname{tank} B$ through the six rectangular slots indicated in Fig. P8.61. If the total flowrate is $30 \mathrm{~mm}^{3} / \mathrm{s}$ and minor losses are negligible, determine the pressure in $\operatorname{tank} A$.

Figure P8.61