300-meter-long train passes through a tunnel at a speed of 108 kilometers per hour. The time when the front of the train enters the tunnel is 11:59:12, and the time when the rear of the train exits the tunnel is 12:00. Zero three minutes and forty seconds, how many meters is the length of this tunnel?
一列长300米的列车以每小时108千米的速度通过一座隧道，列车车头进入隧道时的时间是十一时五十九分十二秒，列车车尾驶出隧道时的时间是十二时零三分四十秒，求这座隧道的长度是多少米？
<result>7_840</result>