The beam is subjected to the triangular distributed load with a maximum intensity of w₀= 300 lb/ft. If the allowable bending stress is σ_allow= 1.40 ksi, determine the required dimension b of its cross section to the nearest 1/8 in. Assume the support at A is a pin and B is a roller.

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Wo Дь B: -6 ft- 6 ft-