A project can be completed in 10 days alone, and B can be completed in 8 days alone. If two people cooperate to complete (2/3) of this project, how many days will it take?
一项工程，甲单独做10天完成，乙单独做8天完成，如果两人合作完成这项工程的(2/3)，需要几天？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) + (1/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(2/3) / (9/40)</gadget>
<output>80/27 = around 2.962963</output>

<result>80/27 = around 2.962963</result>