To process 6000 parts, it takes 30 days for workshop A to process alone, and 300 parts per day for workshop B to process alone. Now it only takes a few days for the two workshops to jointly process and complete the task?
加工6000个零件，甲车间单独加工需要30天完成，乙车间单独加工每天加工300个，现在两个车间共同加工只要几天就能完成任务？
<gadget id="calculator">6_000 / 30</gadget>
<output>200</output>

<gadget id="calculator">200 + 300</gadget>
<output>500</output>

<gadget id="calculator">6_000 / 500</gadget>
<output>12</output>

<result>12</result>