To complete a project, A and B cooperate to complete it in 10 days, B and C cooperate to complete it in 8 days, and A and C cooperate to complete it in 12 days. If A, B, and C cooperate, how many days can it be completed?
完成一件工程，甲、乙合作10天完成，乙、丙合作8天完成，甲、丙合作12天完成．如果甲、乙、丙三人合作，多少天可以完成．
<gadget id="calculator">37 / 120</gadget>
<output>37/120 = around 0.308333</output>

<gadget id="calculator">(37/120) / 2</gadget>
<output>37/240 = around 0.154167</output>

<gadget id="calculator">1 / (37/240)</gadget>
<output>240/37 = around 6.486486</output>

<result>240/37 = around 6.486486</result>