Two engineering teams, A and B, want to build a 123km road. Team A and Team B start from the two ends of the road respectively. Team A repairs 4.5km every day, and team B repairs 3.7km every day. How many days will it take to repair this road?
甲乙两个工程队要修一条123km的公路，甲队和乙队分别从路的两端修起．甲队每天修4.5km，乙队每天修3.7km，多少天修好这条公路？
<gadget id="calculator">4.5 + 3.7</gadget>
<output>8.2</output>

<gadget id="calculator">123 / 8.2</gadget>
<output>15</output>

<result>15</result>