A job can be completed by A alone in 10 days, and B's work efficiency is 2/3 of A's. If the two teams cooperate, how many days can they complete the job?
一项工作，甲单独做10天完成，乙的工作效率是甲的(2/3)，如果两队合作，多少天可以完成这项工作？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/10) * (2/3)</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>