person dug a canal. On the first day, he dug 30% of the total length. On the second day, he dug the first day (8/9). On the third day, he dug all the canals. It is known that the third is 75 meters longer than the second. So how long is the canal in meters?
某人挖水渠，第一天挖了全长的30%，第二天挖的是笫一天的(8/9)，笫三天全部挖完，已知笫三比笫二多挖75米，那么水渠全长多少米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(3/10) * (8/9)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 - (3/10) - (4/15) - (4/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">75 / (1/6)</gadget>
<output>450</output>

<result>450</result>