Two engineering teams jointly laid a section of underground oil pipeline. When the paving is completed, team A has paved 40% of the total length, and team B has paved 2.4 kilometers more than team A. How long is this oil pipeline in meters?
两个工程队合铺一段地下石油管道．铺完时甲队铺了全长的40%，乙队比甲队多铺了2.4千米．这段石油管道长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2.4 / (1/5)</gadget>
<output>12</output>

<result>12</result>