A project requires 10 days for team A to complete alone, and 12 days for team B to complete it alone. After the two teams work together for 3 days, only one team will be assigned to complete the remaining work. How many more days will it take?
一项工程，甲队单独做需要10完成，乙队单独做需要12完成，两队合做3天后，只安排一个队完成剩下的工作，至少还需要多少天？
<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">(11/60) * 3</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) / (1/10)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>