A certain engineering team built a road, and repaired the full length (1/4) on the first day, and the full length (1/3) on the second day, and at this time the midpoint was 10 kilometers away. How long is this road in kilometers?
某工程队修一条公路，第一天修了全长的(1/4)，第二天修了全长的(1/3)，这时超过中点10千米．这条公路全长多少千米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/3) - (1/2)</gadget>
<output>-1/6 = around -0.166667</output>

<gadget id="calculator">(1/4) + (-1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">10 / (1/12)</gadget>
<output>120</output>

<result>120</result>