$----$JUST WRITE THE SOLUTION OUT. THANKS $---$

Consider the sketch below. The same box as question #$1$ is now lying horizontally. The tanks at each end have been left as they were, so the tank at the left end has a water level $0\mathrm{.}35m$ higher than the box at the right end. Again, the tanks keep the sand in the box completely $100\%$ saturated.

a$)$ What is the pore pressure at each corner of the box $($upper and lower left, upper and lower right$)??$

b$)$ What is the hydraulic gradient from left to right in the box?

c$)$ How much water will flow in the box and in which direction?