Two engineering teams, A and B, respectively dig a tunnel from two ends. Team A digs 20 meters a day, and team B digs 23 meters a day. Team A digs 5 days later, and then team B starts from the other end, and finishes the tunnel after 120 days. How many meters is this tunnel?
甲乙两个工程队分别从两端开凿一条隧道，甲队每天凿20米，乙队每天凿23米，甲队先开凿5天后，乙队才从另一端开始，120天后凿完．这条隧道长多少米？
<gadget id="calculator">120 * 20</gadget>
<output>2_400</output>

<gadget id="calculator">120 - 5</gadget>
<output>115</output>

<gadget id="calculator">23 * 115</gadget>
<output>2_645</output>

<gadget id="calculator">2_400 + 2_645</gadget>
<output>5_045</output>

<result>5_045</result>