To build a canal, the first week was repaired (1/4), and the second week was repaired (1/3). There are still 2 kilometers left to be repaired. How long is this canal in kilometers?
修一条水渠，第一周修了(1/4)，第二周修了(1/3)，还剩2千米未修．这条水渠全长多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">2 / (5/12)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>