A project can be completed by team A alone in 10 days, and by team B in 12 days. Now that teams A and B work together, how many days will it take to complete half of the project?
一项工程，甲队单独做需10天完成，乙队单独做需12天完成，现由甲、乙两队合作，多少天能完成这项工程的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/10) + (1/12)</gadget>
<output>11/60 = around 0.183333</output>

<gadget id="calculator">(1/2) / (11/60)</gadget>
<output>30/11 = around 2.727273</output>

<result>30/11 = around 2.727273</result>