The road repair team repaired a road. On the first day, it built 540 meters. On the second day, it repaired 20% of the total length compared with the first day, and the remaining 30% of the total length was not repaired. How long is this road in meters?
修路队修一条公路，第一天修了540米，第二天比第一天多修全长的20%，还余下全长的30%没有修，这条公路全长多少米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (3/10) - (1/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">540 / (1/4)</gadget>
<output>2_160</output>

<result>2_160</result>