A road repair team needs to repair a section of road. It repaired (1/5) kilometers on the first day and (3/10) kilometers on the second day. It happened to repair this (1/20) section of road in two days. How many kilometers long?
某修路队需要修一段公路，第一天修了(1/5)千米，第二天修了(3/10)千米，两天正好修了这段(1/20)公路的，这段公路长多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/2) / (1/20)</gadget>
<output>10</output>

<result>10</result>