The road repair team repaired a road. On the first day, they repaired 1/4 of the total length, and on the second day, they repaired 20% of the total length. In two days, they built a total of 3.6 kilometers. How long is this road?
修路队修一条公路，第一天修了全长的(1/4)，第二天修了全长的20%，两天共修了3.6千米，这条公路有多长？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">3.6 / (9/20)</gadget>
<output>8</output>

<result>8</result>