An engineering team repairs a road. It repairs 25% of the total length in the first month, 40% of the total length in the second month, and repairs 12 kilometers more in the second month than in the first month. What is the total length of this road? km?
一个工程队修一条公路，第一个月修了全长的25%，第二个月修了全长的40%，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">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 / 100</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>