The engineering team has repaired a section of road, which has already been repaired for 8.4 kilometers, which accounts for exactly 80% of the total length. How many kilometers is the total length of this section of road?
工程队修一段公路，已经修了8.4千米，正好占全长的80%，这段公路全长多少千米？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">8.4 / (4/5)</gadget>
<output>10.5</output>

<result>10.5</result>