A project can be completed by A alone in 5 days (1/3), and B alone can complete it in 12 days. Now two people will work together for 2 days, and the rest of the project will be completed by B. How many days will it take to complete?
一项工程，甲独做5天完成这项工程的(1/3)，乙独做12天完成．现在先由两人合作2天，剩下的工程由乙完成，还要多少天完成？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / 5</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(1/15) + (1/12)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) / (1/12)</gadget>
<output>42/5 = around 8.4</output>

<result>42/5 = around 8.4</result>