A certain project has been budgeted and it takes 6 days for Team A to complete it, and 3 days for Team B to complete it alone, how many days will it take for Team A and Team B to complete it together?
有某项工程经过预算，甲队完成需6天，乙队单独完成需3天，则甲乙两队合作完成需多少天．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/6) + (1/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<result>2</result>