<|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
 A motorboat can travel at different speeds in still water depending on the wind conditions. When traveling with the wind, its speed is 21 kmph, and against the wind, its speed is 17 kmph. The boat takes 7 hours to complete a round trip from point A to point B and back. Additionally, the speed of the stream is not constant; from A to B, it flows at 3 kmph, and on the way back from B to A, the stream speed decreases to 2 kmph. What is the distance between point A and point 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
65
A motorboat can travel at different speeds in still water depending on the wind conditions. When traveling with the wind, its speed is 21 kmph, and against the wind, its speed is 17 kmph. The boat takes 7 hours to complete a round trip from point A to point B and back. Additionally, the speed of the stream is not constant; from A to B, it flows at 3 kmph, and on the way back from B to A, the stream speed decreases to 2 kmph. What is the distance between point A and point B?
test