<|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 boatman is trying to cross a river with a certain width. He is sailing the boat with 10 m/sec. He takes 50 sec to cross the river due to the flow of water. The drift is 300 m. What is the width of the river? 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
500
A boatman is trying to cross a river with a certain width. He is sailing the boat with 10 m/sec. He takes 50 sec to cross the river due to the flow of water. The drift is 300 m. What is the width of the river?
test