It takes 8 days for team A to repair a road alone, and 12 days for team B to repair it alone. After the two teams jointly repair it for 4 days, the rest will be repaired by team B alone. How many days did team B spend together?
修一条路，甲队单独修需8天，乙队单独修需12天，两队合修4天后，剩下的由乙队单独修，乙队共修了多少天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) / (1/12)</gadget>
<output>6</output>

<result>6</result>