The highway engineering team rushed to repair a 3-kilometer-long section of road, and completed 1,200 meters in the first 4 days. At this speed, how many days will it take to complete the road? (Solve with ratio)
公路工程队抢修3千米长的一段公路，开始4天完成了1200米．照这样的速度，修完这段公路一共要多少天？(用比例解)
<gadget id="calculator">3_000 * 4</gadget>
<output>12_000</output>

<gadget id="calculator">12_000 / 1_200</gadget>
<output>10</output>

<result>10</result>