A truck is 240 meters long and travels 15 meters per second. The whole vehicle passes through a tunnel and a bridge continuously for 40 seconds. The bridge is 150 meters long. How long is the tunnel?
一列货车全长240米，每秒行驶15米，全车连续通过一条隧道和一座桥，共用40秒钟，桥长150米，这条隧道长多少米？
<gadget id="calculator">40 * 15</gadget>
<output>600</output>

<gadget id="calculator">240 + 150</gadget>
<output>390</output>

<gadget id="calculator">600 - 390</gadget>
<output>210</output>

<result>210</result>