The construction team digs a canal. The ratio of the meters that have been dug to those that have not been dug is 1:5. After the construction team has dug another 200 meters, the number of meters dug by B is 1/5 of the total length of the canal. How long is this canal?
施工队挖一条水渠，已经挖的和还没有挖的米数的比是1：5，施工队又挖了200米后，乙挖的米数是这条水渠总长度的(1/5)，这条水渠有多长？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">200 / (1/30)</gadget>
<output>6_000</output>

<result>6_000</result>