In the construction of the new countryside, Dongsheng Village has built three concrete roads, the first one is 0.78 kilometers long, which is 0.24 kilometers shorter than the second one, and the total length of the first and second roads is 1.5 times the length of the third road. , how many kilometers is the length of the third concrete road?
在新农村建设中，东升村修了三条水泥路，第一条长0.78千米，比第二条少0.24千米，第一条和第二条路的总长的1.5倍正好是第三条路长，第三条水泥路长是多少千米？
<gadget id="calculator">0.78 + 0.78 + 0.24</gadget>
<output>1.8</output>

<gadget id="calculator">1.8 * 1.5</gadget>
<output>2.7</output>

<result>2.7</result>