Seepage is occurring through a porous media shown in the figure. The hydraulic conductivity values $(k_1, k_2, k_3)$ are in m/day.

The seepage discharge ($m^3/day$ per m) through the porous media at section $\color{red}{PQ}$ is

1. $\dfrac{7}{12} \\$
2. $\dfrac{1}{2} \\$
3. $\dfrac{9}{16} \\$
4. $\dfrac{3}{4}$