I need help solving and understanding the following question about boundary conditions and Laplace's equation.

5. Consider an infinitely long rectangular metal pipe with side widths a and b. The metal pipe is closed at one end (at x = 0). The closed surface is maintained at a specified potential V0(y,z). All other surfaces of the pipe are grounded. (a) Write down the Laplace's equation for the potential inside the pipe using the appropriate coordinates. (b) Write down the boundary conditions for the Laplace's equation. (0) Separate variables and write down the general solutions of the Laplace's equation. (d) Plug in the homogenous boundary conditions to simplify the general solution