Two wood beams, each of rectangular cross section (3.0 in. x 4.0 in., actual dimensions) are glued together to form a solid beam of dimensions 6.0 in. x 4.0 in. (see figure). The beam is simply supported with a span of 8 ft.
What is the maximum moment Mmax that may be applied at the left support if the allowable shear stress in the glued joint is 200 psi? (Include the effects of the beam's own weight, assuming that the wood weight 35 Ib/ft3.)

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4.0 in 6.0 in. 8 ft