The hat workshop planned to produce 2,200 hats of a certain kind, but actually completed the batch of hats in 3 days (6/11). According to this calculation, how many days will it take to complete the production task of this batch of hats?
帽子车间计划生产某种帽子2200顶，实际3天就完成了这批帽子的(6/11)．照这样计算，完成这批帽子的生产任务一共要多少天？
<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">3 / (6/11)</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>