Xiaojun takes a puppy and walks from A to B at the same time. The distance between A and B is 1200m. Xiaojun walks 120m per minute, and puppy runs 240m per minute. After the puppy ran to B, he immediately turned around and ran towards Xiaojun, and then ran towards B when he met Xiaojun... When Xiaojun arrived at B, how many meters did the puppy run in total?
小军带着一条小狗，同时从A地走向B地，A、B两地相距1200m．小军每分钟行120m，小狗每分钟跑240m．小狗跑到B地后立即掉头向小军这边跑，遇到小军后再向B地这边跑…当小军到达B地时，小狗一共跑了多少米？
<gadget id="calculator">1_200 / 120</gadget>
<output>10</output>

<gadget id="calculator">10 * 240</gadget>
<output>2_400</output>

<result>2_400</result>