Physical Education Elementary School organizes students to line up for walks and outings. The walking speed is 1 meter per second. Teacher Wang at the end of the line rushes to the front of the line at a speed of 2.5 meters per second, and then immediately returns to the back of the line for 10 minutes. Find the length of the team.
体育小学组织学生排成队步行与郊游，步行的速度是每秒1米，队尾的王老师以每秒2.5米的速度赶到队伍的最前面，然后立即返回队尾，共用10分钟．求队伍的长度．
<gadget id="calculator">10 * 60 * 2.5 * 2.5</gadget>
<output>3_750</output>

<gadget id="calculator">10 * 60 * 2.5</gadget>
<output>1_500</output>

<gadget id="calculator">10 * 60</gadget>
<output>600</output>

<gadget id="calculator">1_500 - 1_500 - 600</gadget>
<output>-600</output>

<gadget id="calculator">3_750 + (-600)</gadget>
<output>3_150</output>

<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">2.5 + 2.5 + 0</gadget>
<output>5</output>

<gadget id="calculator">3_150 / 5</gadget>
<output>630</output>

<result>630</result>