The road construction team built a canal. On the first day, they built a full length (1/4), and on the second day, they built 20% of the total length. In two days, they built a total of 1.35 kilometers. How long is this canal?
修路队修一条水渠，第一天修了全长的(1/4)，第二天修了全长的20%，两天共修了1.35千米，这条水渠有多长？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1.35 / (9/20)</gadget>
<output>3</output>

<result>3</result>