It takes 10 days for team A to build a section of road, and it takes 15 days for team B to finish it alone. If the two teams work together to build this section of road, how many days will it take to complete it?
修一段路，甲队10天完成，乙队单独要15天完成，如果两队共同修这段路，要多少天才能完成？
<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>