Two engineering teams, A and B, dig a tunnel at the same time from both ends. Team A excavates 18 meters per day, and Team B excavates 32 meters per day, and the excavation is completed after 120 days. How many meters is this tunnel?
甲、乙两个工程队分别从两端同时开凿一条隧道．甲队每天开凿18米，乙队每天开凿32米，120天后凿完．这条隧道长多少米？
<gadget id="calculator">18 + 32</gadget>
<output>50</output>

<gadget id="calculator">50 * 120</gadget>
<output>6_000</output>

<result>6_000</result>