A canal in Zhangcun has been repaired for 5.82 kilometers, and the remaining area is 0.42 kilometers longer than the completed one. How many kilometers is this canal?
张村修一条水渠，已经修好了5.82千米，剩下的比修好的多0.42千米．这条水渠长多少千米？
<gadget id="calculator">5.82 + 0.42</gadget>
<output>6.24</output>

<gadget id="calculator">5.82 + 6.24</gadget>
<output>12.06</output>

<result>12.06</result>