Master Wang needs to produce 500 parts, 140 of which have already been made, and the rest needs to be completed within 6 hours. How many parts does Master Wang need to make per hour?
王师傅要生产500个零件，已经做了140个，剩下的要在6小时内完成，王师傅每小时需要做多少个？
<gadget id="calculator">500 - 140</gadget>
<output>360</output>

<gadget id="calculator">360 / 6</gadget>
<output>60</output>

<result>60</result>