A job can be completed in 15 days by A alone, and 10 days by B alone, how many days will it take to complete (1/3) of the job if two people cooperate?
一项工作，甲独做15天可以完成，乙独做10天可以完成，如果两人合作要完成这项工作的(1/3)，需要多少天．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

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

<result>2</result>