To repair a section of road, if team A alone completes the repair in 15 days, team B alone completes the repair in 20 days. Now Team A will work alone for 5 days, and the rest will be done jointly by Team A and Team B. How many days did Team B spend on the completion of the project?
修一段公路，如果甲队单独修15天完成，乙队单独修20天完成．现在甲队先单独修5天，剩下的由甲、乙两队合修，完工时乙队修了多少天？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) / (1/6)</gadget>
<output>4</output>

<result>4</result>