Two people, A and B, are walking toward each other from two places 3000 meters apart at the same time. A travels 70 meters per minute, and B travels 80 meters per minute. A puppy runs 100 meters per minute with A. When the dog meets B, it immediately turns around and runs towards A. After meeting A, it runs towards B. Repeat this until the two meet. How much does the dog run? rice?
甲乙两人同时从相距3000米的两地相向而行，甲每分钟行70米，乙每分钟行80米．一只小狗与甲一起出处，每分钟跑100米，狗与乙相遇后立即掉头向甲跑去，遇到甲后又向乙跑去，如此反复直到两人相遇，这只狗跑了多少米？
<gadget id="calculator">70 + 80</gadget>
<output>150</output>

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

<gadget id="calculator">100 * 20</gadget>
<output>2_000</output>

<result>2_000</result>