A bronze spur gear (endurance strength: 00-83 MPa) is to drive a mild steel pinion (endurance strength:00=103 MPa). The angular velocity ratio is to be 3/2. The pressure angle is 14.5°. Determine the smallest diameter gears that can be used and the necessary face width to transmit 5kW at 1800 rev/min of the pinion. Design for strength only. No less than 15 teeth are to be used on either gear.