team is 3,000 meters long and advances at a speed of 50 meters per minute. The liaison officer of the team rushes from the end of the line to the head of the line, and then immediately returns to the back. How many minutes?
一支队伍长3000米，以每分钟50米的速度前进，队伍的联络员，有事从排尾赶到排头，又立即返回排尾，如果联络员骑自行车每分钟行200米，他往返一趟用多少分钟？
<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<gadget id="calculator">3_000 / 150</gadget>
<output>20</output>

<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">3_000 / 250</gadget>
<output>12</output>

<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<result>32</result>