Build a road, 39.6 kilometers in the first 3 days. According to this speed, another 118.8 kilometers were repaired. How many days did it take to complete the road?
修一条路，前3天修39.6千米．按这样的速度又修了118.8千米，修完这条路一共用了多少天？
<gadget id="calculator">39.6 / 3</gadget>
<output>13.2</output>

<gadget id="calculator">118.8 / 13.2</gadget>
<output>9</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<result>12</result>