A road repair team originally planned to repair 400 meters per day, which can be completed in 15 days. As a result, the task was completed in 12 days, how many meters were actually repaired every day? (Solve with ratio)
一个修路队，原计划每天修400米，15天可以修完．结果12天就完成任务，实际每天修多少米？(用比例解)
<gadget id="calculator">400 * 15</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 / 12</gadget>
<output>500</output>

<result>500</result>