A project can be completed in 10 days jointly by A and B, team A alone can complete it in 30 days, team A can complete it alone after 10 days, and then team B can complete it alone. How many days does team B need to complete?
一项工程，甲、乙合做10天完成，甲队单独做30天完成，甲队单独做了10天后，由乙队单独完成，乙队需要几天完成？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 10</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 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) - (1/30)</gadget>
<output>1/15 = around 0.066667</output>

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

<result>10</result>