The road construction team repaired a road, and repaired the full length (1/5) on the first day, and 12 kilometers on the second day, and repaired the full length (1/2) in two days. How long is this road in kilometers?
修路队修一条路，第一天修了全长的(1/5)，第二天修了12千米，两天共修了全长的(1/2)．这条路全长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">12 / (3/10)</gadget>
<output>40</output>

<result>40</result>