Qizhi Toy Factory plans to produce 12,000 electric cars in October, and produced 40% of these electric cars in the first 10 days. At this speed, how many days can the task be completed in advance? (Solve with ratio)
启智玩具厂十月份计划生产电动小汽车12000辆，前10天生产了这批电动小汽车的40%．照这样的速度，可提前几天完成任务？(用比例解)
<gadget id="calculator">12.4 - 10</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 / 0.4</gadget>
<output>6</output>

<result>6</result>