A composite cantilever beam 140-mm wide, 300-mm deep, and 3-m long is fabricated by fast...

A composite cantilever beam 140-mm wide, 300-mm deep, and 3-m long is fabricated by fastening two timber planks to the sides of a steel plate 20-mm wide by 300-mm deep. Note that the 300-mm dimension is vertical.The allowable stresses in bending for timber and steel are 7 and 120 MPa, respectively. Calculate the maximum vertical load P the beam can carry at its free end.