Two engineering teams jointly excavated a 126-meter-long tunnel, each working from one end to the other at the same time, and it took 14 days to get through. Team A excavated 5 meters per day, and how many meters did team B excavate per day?
两个工程队共同开凿一条长126米长的隧道，各从一端同时相向施工，14天打通，甲队每天开凿5米，乙队每天开凿多少米？
<gadget id="calculator">126 / 14</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>