A canal was dug by teams A and B in 30 days. Now after 12 days of joint digging, team B will dig the rest, and it will take another 24 days. How many days will it take for this canal to be dug by team B alone?
一条水渠，甲乙两队合挖30天完工，现在合挖12天后，剩下的由乙队挖，又用24天挖完，这条水渠由乙队单独挖，需要多少天．
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 12</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 24</gadget>
<output>1/40 = around 0.025</output>

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

<result>40</result>