To build a road, teams A and B work together to complete it in 12 days. Now, team A will work on it for 8 days and complete the full length (2/5). How many days will it take for team B to complete the rest alone?
修一条公路，甲乙两队合做12天完成，现在先由甲队做8天，完成了全长的(2/5)，剩下的由乙队单独做还要多少天完成？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(2/5) / 8</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/12) - (1/20)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(3/5) / (1/30)</gadget>
<output>18</output>

<result>18</result>