Two engineering teams, A and B, work together to repair a section of road with a length of 840 meters. Team A repairs 32 meters a day, and team B repairs 38 meters a day. Both teams start to repair at the same time. How many days can they finish the road?
甲、乙两个工程队合作修一段长840米的公路，甲队每天修32米，乙队每天修38米，两队同时开始修，多少天可以修完这条公路？
<gadget id="calculator">38 + 32</gadget>
<output>70</output>

<gadget id="calculator">840 / 70</gadget>
<output>12</output>

<result>12</result>