The digging of a canal in Longshan Township has now completed (1/3) of the full length, and there are still 5 kilometers away from the midpoint. How many kilometers is this canal?
龙山乡挖一条水渠，现在已完成了全长的(1/3)，离中点还有5千米．这条水渠长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

<result>30</result>