In the first week of building a water canal, the full length (1/3) was built, and another 300 meters was repaired. At this time, the full length (1/2) was just repaired. How many meters is the total length of this canal?
修一条水渠第一周修了全长的(1/3)，再修300米，这时正好修了全长(1/2)，这条水渠全长多少米？
<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">300 / (1/6)</gadget>
<output>1_800</output>

<result>1_800</result>