A project can be completed by team A in 4 days and team B in 6 days. Working together, the two teams can complete the project ((())/(())) every day.
一项工程，甲队独做4天完成，乙队独做6天完成．两队一起做，每天可以完成这项工程的((())/(()))．
<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>

<result>5/12 = around 0.416667</result>