To excavate a tunnel, it takes Team A 20 days to complete digging alone, and Team B 30 days to complete digging alone. After B digs 10 days, how many days will it take for the remaining team A to complete?
开凿一个隧道，甲队单独挖要20天完成，乙队单独挖要30天才能完成，乙挖10天后，剩下的甲队还要多少天才能完成？
<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 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(2/3) / (1/20)</gadget>
<output>40/3 = around 13.333333</output>

<result>40/3 = around 13.333333</result>