A construction team paved a section of railway, originally planned to complete it in 30 days, but actually paved 0.8 kilometers per day, but it was completed 6 days ahead of schedule, how many meters per day was originally planned? (Solve with ratio)
一个建筑队铺一段铁路，原计划用30天完成，实际每天铺0.8千米，结果提前6天完成，原计划每天铺多少米？(用比例解)
<gadget id="calculator">0.8 * 30</gadget>
<output>24</output>

<gadget id="calculator">0.8 * 6</gadget>
<output>4.8</output>

<gadget id="calculator">24 - 4.8</gadget>
<output>19.2</output>

<gadget id="calculator">19.2 / 30</gadget>
<output>0.64</output>

<gadget id="calculator">0.64 * 1_000</gadget>
<output>640</output>

<result>640</result>