To build a road, team A alone can complete it in 10 days, and team B alone can complete it in 15 days. If the two teams work together, how many days can they finish half of the road?
修一条路，甲队单独修10天完成，乙队单独修15天完成，如果两队合修，几天可以修完这条路的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<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">(1/2) / (1/6)</gadget>
<output>3</output>

<result>3</result>