Two engineering teams, A and B, excavate tunnels simultaneously from both ends. Team A excavates 17 meters per day, and team B excavates 83 meters per day. 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隧道，甲队每天开凿17米，乙队每天开凿83米，120天后开凿完．这条隧道长多少米？
<gadget id="calculator">17 + 83</gadget>
<output>100</output>

<gadget id="calculator">100 * 120</gadget>
<output>12_000</output>

<result>12_000</result>