batch of parts. If you do it alone. The master needs 6 hours to complete. The apprentice needs 8 hours to complete, and now the two of them will work together for 1 hour. Exactly 140 parts were made. How many parts are there in this batch?
一批零件．如果单独做．师傅需6小时完成．徒弟需8小时完成、现在两人合作1小时后．正好做了140个零件．这批零件有多少个？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/6) + (1/8)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">140 / (7/24)</gadget>
<output>480</output>

<result>480</result>