To build a road, team A will complete it in 10 days alone, and team B will complete the full length (1/5) in 3 days alone. How many days will the two teams work together?
修一条路，甲队独修要10天完成，乙队独修3天完成全长的(1/5)，两队合做，几天完成？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 3</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>