Master Luo and his apprentice worked together to process a batch of parts. In 6 hours, master Luo processed 420 pieces, and the apprentice processed 360 pieces. How many more parts did Master Luo process per hour than his apprentice?
罗师傅和徒弟共同加工一批零件，6小时中，罗师傅加工了420个，徒弟加工了360个，罗师傅每小时比徒弟每小时多加工多少个零件？
<gadget id="calculator">420 - 360</gadget>
<output>60</output>

<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<result>10</result>