An engineering team repaired 18 kilometers of canals on the first day, and 2 kilometers more on the second day than the first day. The second day and the first day totaled 70% of the total length. How long is this canal in kilometers?
某工程队修水渠，第一天修18千米，第二天比第一天多修2千米，第二天和第一天共修全长的70%，这条水渠长多少千米？
<gadget id="calculator">18 + 2 + 18</gadget>
<output>38</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">38 / (7/10)</gadget>
<output>380/7 = around 54.285714</output>

<result>380/7 = around 54.285714</result>