It takes 12 days for a road to be repaired jointly by two road construction teams A and B. Now it will be repaired by team A for 3 days, and then by team B for 1 day. The total road construction (3/20) is completed. If this road is repaired by Team A alone, how many days will it take to complete the repair?
一条公路由甲、乙两个筑路队合修要12天完成，现在由甲队修3天后，再由乙队修1天，共修了这条公路的(3/20)．如果这条公路由甲队单独修，要多少天才能修完？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) - (1/12)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">(1/15) / 2</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>