Hongxing Tent Factory organized workers to work overtime after receiving the urgent task of producing 1,200 tents for the disaster-stricken areas in Sichuan. 40% of the work was completed in the first three days. Based on this calculation, how many days will it take to complete the task?
宏兴帐篷厂接到为四川灾区生产1200顶帐篷的紧急任务后组织工人加班，前3天完成了40%，照这样计算，完成任务还需要多少天？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/5) / 3</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(3/5) / (2/15)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>