A project can be completed by team A alone in 10 days, and team B alone can take 5 days longer than team A. How many days will it take for the two teams to work together?
一项工程，甲队单独做10天完成，乙队单独做比甲队多用5天，两队合作，需要多少天完成？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">1 / 15</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>