I am lost on how to do this question

The following figure (figure 1) shows a composite wall built with six different materials. The wall has a width of 20m (into the paper), and the height ' h ' is 10m. The wall separates two different fluids. Following information is available. T,1=10C,h1=25W/(m2,C),T00,2=30C,h1=10W/(m2.C) Thermal Conductivities: k1=0.9W/(m.C),k2=0.7W/(m.C),k3=0.5W/(m.C),k4=0.3W/(m.C), K5=0.25W/(m.0C),K6=0.9W/(m.0C) Thicknesses: t1=10mm,t2=20cm,t3=10cm Calculate neglecting the radiation; 3.1 steady state heat transfer rate through the wall (10 points) T,1 3.2 wall surface temperatures (five points) 3.3 interface temperatures (five points) 3.4 What are the assumptions made in the solution process of the problem? (five points) Figure 1