It takes 16 days for Team A to complete an excavation project alone, and 20 days for Team B to complete it alone. Now the two teams are working at the same time, and the work efficiency has increased by 20%. When (1/4) of the entire project was completed, the construction progress was affected due to landslides, which reduced the excavation by 189 cubic meters per day. As a result, it took 10 days to complete the entire project. How many cubic meters of soil is planned to be excavated for this project?
一项揭挖土工程，甲队单独完成要用16天，乙队单独完成要用20天．现在两队同时施工，工作效率提高20%，当完成全部工程的(1/4)时，因发生塌方，影响了施工进度，使得每天少挖土189立方米，结果共用10天完成全部工程．求这项工程计划挖土多少方？
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/16) + (1/20)</gadget>
<output>9/80 = around 0.1125</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(9/80) * (6/5)</gadget>
<output>27/200 = around 0.135</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / (27/200)</gadget>
<output>50/27 = around 1.851852</output>

<gadget id="calculator">10 - (50/27)</gadget>
<output>220/27 = around 8.148148</output>

<gadget id="calculator">(3/4) / (220/27)</gadget>
<output>81/880 = around 0.092045</output>

<gadget id="calculator">(27/200) - (81/880)</gadget>
<output>189/4_400 = around 0.042955</output>

<gadget id="calculator">189 / (189/4_400)</gadget>
<output>4_400</output>

<result>4_400</result>