6. The lap joint shown in the figure, 120 mm wide, is fastened by three 20-mm diameter rivets. Assuming that P = 50 KN, determine (a) the shearing stress in each rivet, (b) the bearing stress in each plate if the thickness of each plate is 25 mm, and (c) the maximum average tensile stress in each plate. Assume that the axial load P is distributed equally among the three rivets. P P