A village builds a brook for 3 days. On the first day, 20% of the total length is built. The ratio between the second day and the third day is 6:5. The second day is 4 kilometers longer than the third day. The creek is completely How many kilometers long is it?
某村3天修一道小溪，第一天修全长的20%，第二天与第三天修的比是6：5，第二天比第三天多修4千米，小溪全长是多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(6/11) - (5/11)</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">(4/5) * (1/11)</gadget>
<output>4/55 = around 0.072727</output>

<gadget id="calculator">4 / (4/55)</gadget>
<output>55</output>

<result>55</result>