A task can be completed by Team A alone in 10 days, and Team B can only complete (2/3) of the whole work in the same time. How many days will it take Team A and Team B to complete this task together?
一项工作，甲队单独做10天完成，乙队用同样的时间只能完成全部工作的(2/3)，甲、乙两队合做这项工作要多少天完成．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(2/3) / 10</gadget>
<output>1/15 = around 0.066667</output>

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

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

<result>6</result>