Two engineering teams, A and B, jointly repair a road with a length of 5500 meters. Team A repairs 120 meters per day, and team B repairs 100 meters per day. How many days will it take for the two teams to build this road together?
甲乙两个工程队，合修一条长是5500米的公路，甲队每天修120米，乙队每天修100米．两队合修完这条公路需要多少天？
<gadget id="calculator">120 + 100</gadget>
<output>220</output>

<gadget id="calculator">5_500 / 220</gadget>
<output>25</output>

<result>25</result>