It takes 5 days for A to complete a job alone, and 1 day longer for B to complete it alone. How many days will it take for A and B to complete it together?
一件工作，甲单独做需要5天完成，乙单独完成的时间比甲多1天，问甲、乙两人合作需要几天完成？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">1 / (11/30)</gadget>
<output>30/11 = around 2.727273</output>

<result>30/11 = around 2.727273</result>