A 0.9 m d 0.7 m T =6kN m B TB = 14 kN. 0.5 m 120 mm m C Tc=26 kN m D T = 6 kN m Shaft BC is hollow with inner and outer diameters of 90 mm and 120 mm, respectively. Shafts AB and CD are solid of diameter d. Determine: (a) the minimum and maximum shearing stress in shaft BC, (b) the required diameter d of shafts AB and CD if the allowable shearing stress in these shafts is 65 MPa.