and B travel together by bicycle. A starts first and walks an average of 200 meters per minute. After A starts for 5 minutes, B takes a dog and chases him at a speed of 250 meters per minute. The dog runs 300 meters per minute. After catching up with A, he returns immediately; After that, B immediately chases after A until B catches up with A. How many meters did the dog run at this time?
甲、乙两人骑车出外旅游．甲先出发，平均每分钟行200米，甲出发5分钟后，乙带一条狗出发，以每分钟250米的速度追去，狗每分钟跑300米，追上甲后，立即返回；见到乙后又立即向甲追去，直到乙追上甲．这时狗跑了多少米？
<gadget id="calculator">250 - 200</gadget>
<output>50</output>

<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10) * 300</gadget>
<output>6_000</output>

<result>6_000</result>