A project is completed in 20 days by A alone, 24 days by B alone, and 11 days by A. How many days will it take for A and B to work together?
一项工程甲独做20天完成，乙独做24天完成，甲做11天的工作量，甲乙合做要几天？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 11</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/20) + (1/24)</gadget>
<output>11/120 = around 0.091667</output>

<gadget id="calculator">(11/20) / (11/120)</gadget>
<output>6</output>

<result>6</result>