A student team is 600 meters long, traveling at a speed of 50m/min, and a motorcycle at a speed of 250m/min. They start chasing the head of the queue from the tail, and immediately return to the tail after chasing the head of the queue. Ask the motorcycle to share a few minutes.
一个学生队伍长600米，行进速度是50m/min，一辆摩托车速度是250m/min，从队尾开始追排头，当追到排头后有立即返回到队尾，求摩托车共用几分钟．
<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<gadget id="calculator">600 / 200</gadget>
<output>3</output>

<gadget id="calculator">250 + 50</gadget>
<output>300</output>

<gadget id="calculator">600 / 300</gadget>
<output>2</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<result>5</result>