The master processes 96 parts at 3 hours, and the apprentice processes 145 parts at 5 hours. How many parts does the apprentice process less than the master per hour on average?
师傅3时加工96个零件，徒弟5时加工145个零件．徒弟平均每时比师傅少加工多少个零件？
<gadget id="calculator">96 / 3</gadget>
<output>32</output>

<gadget id="calculator">145 / 5</gadget>
<output>29</output>

<gadget id="calculator">32 - 29</gadget>
<output>3</output>

<result>3</result>