Two engineering teams, A and B, dig a tunnel from both ends at the same time. Team A digs 17 meters a day, and Team B digs 23 meters a day. The tunnel is completed in 120 days. How many meters is this tunnel?
甲、乙两工程队分别从两端同时开凿一条隧道，甲队每天凿17米，乙队每天凿23米，120天侯凿完．这条隧道长多少米？
<gadget id="calculator">17 + 23</gadget>
<output>40</output>

<gadget id="calculator">40 * 120</gadget>
<output>4_800</output>

<result>4_800</result>