Two engineering teams, A and B, jointly pave a 148.5-kilometer road. Team A is 4.5 kilometers per day, and team B's paving is 1.2 times that of team A. How many days will it take for the two teams to pave the road together?
甲、乙两个工程队合铺一条148.5千米的公路．甲队每天4.5千米，乙队每天铺的是甲队的1.2倍．两队合铺这条公路需要多少天铺完？
<gadget id="calculator">4.5 * 1.2</gadget>
<output>5.4</output>

<gadget id="calculator">4.5 + 5.4</gadget>
<output>9.9</output>

<gadget id="calculator">148.5 / 9.9</gadget>
<output>15</output>

<result>15</result>