A project can be completed by team A in 4 days alone, and team B can complete (2/3) of the whole workload in 4 days alone. How many days can the two teams work together to complete this project?
一项工程，甲队独做4天可以完成，乙队独做4天完成整个工作量的(2/3)，这项工程两队合做多少天可以完成？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / 4</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / (5/12)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>