A project can be completed by team A alone in 4 days and by team B in 6 days alone. How many days can the two teams work together to complete the project (1/10).
一项工程，甲队单独做4天完成，乙队单独做6天完成．两队合做多少天可以完成工程的(1/10)．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(1/10) / (5/12)</gadget>
<output>6/25 = around 0.24</output>

<result>6/25 = around 0.24</result>