In the figure, find the length c of the overhangs so that the beam made of U profile can carry the loading safely. The safety stress (σpulling force) for the tension and compression condition of the...

In the figure, find the length c of the overhangs so that the beam made of U profile can carry the loading safely. The safety stress (σpulling force) for the tension and compression condition of the material is safety = 50 N / mm2, (σb) safety = 80 N / mm2. The support range of the beam is L = 6 m, cross-section dimensions a = 210 mm, b = 150 mm and wall thickness t = 40 mm. The loading condition is P = 30 kN and q0 = 40 kN / m