<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 Xiaodong and Xiaorong start simultaneously from point A to point B. Xiaodong travels 50 meters per minute, and Xiaorong travels 60 meters per minute. Xiaorong returns immediately after reaching point B. The two meet after 10 minutes. How far apart are points A and B? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
550
Xiaodong and Xiaorong start simultaneously from point A to point B. Xiaodong travels 50 meters per minute, and Xiaorong travels 60 meters per minute. Xiaorong returns immediately after reaching point B. The two meet after 10 minutes. How far apart are points A and B?
test