The garment factory processes a batch of garments, and plans to process 360 sets per day, which will be completed in 10 days. In fact, 40 more sets are processed every day. How many days did it actually take to complete the processing task of this batch of garments? (Solve with ratio)
服装厂加工一批服装，计划每天加工360套，10天完成．实际每天多加工40套，完成这批服装的加工任务实际用了多少天？(用比例解)
<gadget id="calculator">360 * 10</gadget>
<output>3_600</output>

<gadget id="calculator">360 + 40</gadget>
<output>400</output>

<gadget id="calculator">3_600 / 400</gadget>
<output>9</output>

<result>9</result>