Students in a certain school advance at a speed of 8 kilometers per hour. The principal asks a student at the end of the line to go to the head of the line to convey instructions to the teacher leading the line, and then returns to the end of the line. The speed of this student is 12 kilometers per hour, and it took 14.4 minutes from rushing to the head of the queue to returning to the end of the queue. What is the length of the queue in meters?
某校学生以8千米/小时的速度前进，校长让一名在队尾的同学到排头去找带队教师传达指示，然后返回队尾．这名同学的速度为12千米/小时，从赶到排头到返回队尾共用了14.4分钟，队伍的长是多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/4) + (1/20)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">0.24 / (3/10)</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 * 1_000</gadget>
<output>800</output>

<result>800</result>