To build a road, it takes 6 days for Team A and Team B to build it together. Team A repairs it for 2 days first, and Team B then repairs it for 3 days. A total of (2/5) of this road has been built. Team B alone will repair this road. How many days to finish?
修一条公路，甲、乙两队合修要6天完成，甲队先修2天，乙队接着修了3天，共修了这条公路的(2/5)，乙队单独修这条公路要多少天完工？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>