Two engineering teams, A and B, dig a tunnel at the same time from both ends. Team A digs 19 meters every day, and Team B digs 31 meters every day. After 110 days, the tunnel will be finished. How long is the tunnel?
甲、乙两个工程队分别从两端同时开凿一条隧道．甲队每天凿19米，乙队每天凿31米，110天后凿完，这条隧道长多少米？
<gadget id="calculator">19 + 31</gadget>
<output>50</output>

<gadget id="calculator">50 * 110</gadget>
<output>5_500</output>

<result>5_500</result>