Two teams, A and B, are building a 3,200-meter road. They start at both ends at the same time. Team A repairs 90 meters a day, and Team B repairs 70 meters a day. How many days will it take for the two teams to finish half of the road?
甲乙两队修一条3200米的公路，他们从两端同时开工，甲队每天修90米，乙队每天修70米，多少天后两队能修完这条路的一半？
<gadget id="calculator">90 + 70</gadget>
<output>160</output>

<gadget id="calculator">3_200 / 2 / 160</gadget>
<output>10</output>

<result>10</result>