For a project, it takes 12 days for team A to do it alone, and the efficiency of team B alone is 3/4 of that of team A. How many days will it take for the two teams to complete the project?
一项工程，甲队单独做需要12天，乙队单独做的效率是甲队的(3/4)，两队合作，几天可完成这项工程？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/12) * (3/4)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/12) + (1/16)</gadget>
<output>7/48 = around 0.145833</output>

<gadget id="calculator">1 / (7/48)</gadget>
<output>48/7 = around 6.857143</output>

<result>48/7 = around 6.857143</result>