One piece of a sheet of cork 3mm thick is placed in contact with one piece of a sheet of my thick, both sheets being 20cm², sheet of glass 5mm thick. The outer pieces of this square composite are maintained at 100 degrees Celsius and 20 degrees Celsius. (1) Find the temperature of the glass. (2) Find the rate of heat transfer through glass and cork. (3) Find the temperature gradient of the two sheets.