Wang Ming and Li Gang processed parts, and processed them for 6 hours at the same time. Wang Ming processed 42 parts per hour, and Li Gang processed 37 parts per hour. How many more educational parts did Wang Ming process than Li Gang?
王明和李刚加工零件，同时加工了6小时，王明每小时加工42个零件，李刚每小时加工37个零件，王明比李刚多加工多少个教育零件．
<gadget id="calculator">42 - 37</gadget>
<output>5</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>