An engineering team repaired a road, and repaired the full length (1/4) in the first month, and repaired the full length (2/5) in the second month, and repaired 12 kilometers more in the second month than in the first month. How long is this road in kilometers?
一个工程队修一条公路，第一个月修了全长的(1/4)，第二个月修了全长的(2/5)，第二个月比第一个月多修12千米，这条公路全长多少千米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">12 / (3/20)</gadget>
<output>80</output>

<result>80</result>