A certain school carried out marching activities and advanced at an average speed of 20 kilometers per hour. During the march, the correspondents at the end of the row chased the leader at a speed of 25 kilometers per hour. When they caught up with the leader of the row, they returned immediately. At the end, the team has advanced 3 kilometers. How many kilometers did the correspondent travel from the head to the tail? (column solution)
某校开展行军活动，以每小时20千米的平均速度前进，在行军中，排尾的通讯员以每小时25千米的速度追赶排头，当赶上排头后又立即返回，当通讯员回去到排尾时，队伍前进了3千米，示通讯员从排头返回排尾进走了多少千米？(列式解答)
<gadget id="calculator">5 + 45</gadget>
<output>50</output>

<gadget id="calculator">45 / 50</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 * (9/10)</gadget>
<output>27/10 = around 2.7</output>

<gadget id="calculator">25 / 20</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(27/10) * (5/4)</gadget>
<output>27/8 = around 3.375</output>

<result>27/8 = around 3.375</result>