A pair of helical gears with 30 degree helix angle is used to transmit 15kW at 10,000 rpm of the pinion. The velocity ratio is 4:1. Both the gears are to be made of hardened steel of static strength 100 N/mm square. The gears are 20 degree stub and the pinion is to have 24 teeth . The face width may be taken as 14 times the module. Find the module and face width from the standpoint of strength and check the gears for wear.