A train is 600 meters long, and it passes through a 200-meter-long tunnel at a speed of 10 meters per second. How much time does it take from the front of the train entering the tunnel to the end of the train leaving the tunnel?
一列火车长600米，它以每秒10米的速度穿过长200米的隧道，从车头进入隧道到车尾离开隧道共需多少时间？
<gadget id="calculator">600 + 200</gadget>
<output>800</output>

<gadget id="calculator">800 / 10</gadget>
<output>80</output>

<result>80</result>