A pair of 20º full-depth involute teeth bevel gears connect two shafts at right angles, having a velocity ratio of 3:1. The gear is made of cast iron, with an allowable static stress of 70 MPa, and the 20-tooth pinion is made of steel, with an allowable static stress of 100 MPa and a hardness of 200 BHN. The pinion works at 750 rpm. Determine the maximum power that can be transmitted by the gears if the module is 10 mm. Kf = 1.4.