A road repair team builds a road. Team A completes the repair in 10 days alone, and Team B completes the repair in 15 days alone. How many days will it take for the two teams to complete the repair together?
修路队修一条公路，甲队独修10天完成，乙队独修15天完成，两队合修几天才能修完？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</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>