A project can be completed in 10 days if A works alone, and (1/3) of the project can be completed in 5 days if team B does it alone. Now that the two teams work together, how many days can this project be completed?
一项工程，如果甲单独做，10天可以完成，如果乙队独做，5天可以完成这项工程的(1/3)．现在两队合作，几天可以完成这项工程？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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