For the cantilever beam shown below P1 = 40 kN and P2=60 kN. Its cross section is shown on the side. Determine (a) the maximum tensile and compressive bending stress in the entire beam, and (b) at a section 3 m to the right of A, the maximum bending stress and the bending stresses at the intersection of the web and flanges. (13 marks) P P 1.8 m B 3.2 m -125 mm 25 mm 150 mm - 150 mm -25 mm 25 mm