In order to resettle the affected people, a town urgently needs 6,000 disaster relief tents. According to the production scale of factory A, it can be completed in 30 days, while the speed of factory B can be completed in 20 days. Due to the urgency of the situation, the local government decided to have the two factories process together. In this way, the tent production task can be successfully completed in a few days?
为安置受灾群众，某乡镇急需6000顶救灾帐篷．根据甲厂的生产规模30天可以完成，乙厂的速度只要20天就可能完成．由于情况紧急，当地政府决定由两厂一起加工，这样的话几天就能顺利完成帐篷的生产任务？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/30) + (1/20)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>