A queue of students in a school is moving at a speed of 8 km/h. At the end of the line, the principal asked a student to run to the front of the line to find the teacher who led the line to convey an instruction, and then immediately returned to the end of the line. The student’s speed was 12 kilometers per hour, starting from the end of the line to the head of the line and then back It took 7.2 minutes to reach the end of the team, so how long is the student team in meters?
某校学生队列以8千米/时的速度前进．在队尾，校长让一名学生跑步到队伍的最前面找带队老师传达一个指示，然后立即返回队尾，这位学生的速度为12千米/时，从队尾出发赶到排头又回到队尾共用了7.2分钟，那么学生队伍的长是多少米．
<gadget id="calculator">7.2 / 60</gadget>
<output>0.12</output>

<gadget id="calculator">0.12 * 12 * 12</gadget>
<output>17.28</output>

<gadget id="calculator">0.12 * 12 * 8</gadget>
<output>11.52</output>

<gadget id="calculator">0.12 * 8 * 12</gadget>
<output>11.52</output>

<gadget id="calculator">0.12 * 8 * 8</gadget>
<output>7.68</output>

<gadget id="calculator">11.52 - 11.52 - 7.68</gadget>
<output>-7.68</output>

<gadget id="calculator">17.28 + (-7.68)</gadget>
<output>9.6</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">12 + 8 + 4</gadget>
<output>24</output>

<gadget id="calculator">9.6 / 24</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 * 1_000</gadget>
<output>400</output>

<result>400</result>