- The queue is 600 meters long and travels at a speed of 2 meters per second. A soldier had to rush from the end of the platoon to the head of the platoon due to something, and immediately returned to the end of the platoon. If he walks 3 meters per second, how many meters does he travel back and forth?
-列队伍长600米，以每秒钟2米的速度行进．一战士因事要从排尾赶到排头，并立即返回排尾．若他每秒钟走3米，那么往返共行多少米．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

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

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

<gadget id="calculator">600 / 1 / 5</gadget>
<output>120</output>

<gadget id="calculator">600 + 120</gadget>
<output>720</output>

<gadget id="calculator">3 * 720</gadget>
<output>2_160</output>

<result>2_160</result>