A project can be completed by team A alone in 10 days, and team B alone can complete the project in 3 days (1/5). If both teams work at the same time, how many days can they complete the task?
一项工程，甲队单独做10天可以完成，乙队单独做3天可以完成这项工程的(1/5)，两队同时做，多少天可以完成任务？
<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>