Two engineering teams, A and B, are building a 2,100-meter-long road. They start work from both ends at the same time. Team A repairs 80 meters every day, and team B repairs 60 meters every day. How many days will it take to finish the road?
甲、乙两个工程队修一条长2100米的公路，他们从两端同时开工，甲队每天修80米，乙队每修60米，多少天后能够修完这条公路？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">2_100 / 140</gadget>
<output>15</output>

<result>15</result>