There was a team marching at a speed of 1.4 m/s, and a correspondent at the end wanted to inform the leader of the platoon, so he felt the head of the platoon at a speed of 2.6 m/s and immediately returned to the end of the platoon. It took 10 minutes and 50 seconds. long?
有一队伍以1.4米/秒得速度行军，末尾有一通讯员因事要通知排头，于是以2.6米/秒得速度从末尾感到排头并立即返回排尾，共用了10分钟50秒，问：队伍有多长？
<gadget id="calculator">2.6 - 1.4</gadget>
<output>1.2</output>

<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<gadget id="calculator">10 / 13</gadget>
<output>10/13 = around 0.769231</output>

<gadget id="calculator">650 * (10/13)</gadget>
<output>500</output>

<gadget id="calculator">1.2 * 500</gadget>
<output>600</output>

<result>600</result>