Two workers, A and B, are digging the same cave on both sides of the mountain at the same time. Team A digs 13.8 meters every day, and Team B digs 15.2 meters every day, and it will be opened in 40 days. How long is this cave in meters?
甲、乙两工人程在山的两边同时开凿同一个山洞，甲队每天开13.8米，乙队每天开15.2米，40天开通．这个山洞全长多少米？
<gadget id="calculator">13.8 + 15.2</gadget>
<output>29</output>

<gadget id="calculator">29 * 40</gadget>
<output>1_160</output>

<result>1_160</result>