A train with a length of 160 meters passes through a cave with a length of 380 meters at a speed of 18 meters per second. How long does it take for the train to pass through the cave (enter the cave until it leaves completely)?
车长160米的一列火车以18米/秒的速度穿过一条380米长的山洞．问火车穿过山洞(进入山洞直至完全离开)需要多少时间？
<gadget id="calculator">160 + 380</gadget>
<output>540</output>

<gadget id="calculator">540 / 18</gadget>
<output>30</output>

<result>30</result>