There are two projects A and B, which are now being completed by two construction teams A and B respectively. On sunny days, team A needs 8 days to complete the project, and team B needs 12 days to complete the project. On rainy days, the work efficiency of construction team A drops by 60%, and that of construction team B drops by 20%. The last two construction teams completed the two projects at the same time. How many days were there rainy days during the construction?
有甲乙两个工程，现分别由A、B两个施工队完成．在晴天A队完成工程需要8天，B队完成工程需要12天，在雨天，A施工队的工作效率下降60%，B施工队的工作效率下降20%．最后两个施工队同时完成这两项工程，问施工的日子里雨天有多少天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * (1/8)</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * (1/12)</gadget>
<output>1/240 = around 0.004167</output>

<gadget id="calculator">(1/120) - (1/240)</gadget>
<output>1/240 = around 0.004167</output>

<gadget id="calculator">(1/24) / (1/240)</gadget>
<output>10</output>

<result>10</result>