To build a road, Team A and Team B will work together to complete it in 12 days. Now Team A will do it in 8 days, completing 2/5 of the total length. How many days will it take for Team B to do 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>