Two engineering teams, A and B, work together to build a road, and they can complete the task in 15 days. Now, team A works alone for 18 days, and then team B works alone for 10 days, just to complete the task. How many days will it take if the work is done by Team B alone?
甲、乙两个工程队合修一条路，15天可以完成任务，现在甲队先单独工作18天，接着乙队单独工作10天，正好完成任务．如果由乙队单独完成这项工作，需要多少天．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 10</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">(1/3) / 8</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/15) - (1/24)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / (1/40)</gadget>
<output>40</output>

<result>40</result>