The Yizheng Section of the Yanjiang Expressway built by the people of Yizheng starts from the famous Xicun Tuqiao and ends at the beautiful green hills. The first phase repaired 1/2 of the full length, and the second phase repaired 25% of the total length, leaving 2.5 kilometers unrepaired. How many kilometers is the total length of the Yizheng section of Yanjiang Expressway?
仪征人民修建的沿江高速仪征段起于著名席村土桥，止于风景优美青山．第一期修了全长的(1/2)，第二期修了全长的25%，还剩2.5千米没有修．沿江高速仪征段公路全长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2.5 / (1/4)</gadget>
<output>10</output>

<result>10</result>