<|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
 At 8 a.m., the ships Knight and Warrior depart from ports A and B, respectively, and travel towards each other. Once Knight reaches the downstream port B and Warrior reaches the upstream port A, they immediately turn around and head back. At 10 a.m., both ships return to their starting points for the first time. It is known that the time it takes for the ships to travel in the same direction is 10 minutes and the speed of the current is 0.5 meters per second. Determine the sailing speed of the Knight ship in still water. 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
6
At 8 a.m., the ships Knight and Warrior depart from ports A and B, respectively, and travel towards each other. Once Knight reaches the downstream port B and Warrior reaches the upstream port A, they immediately turn around and head back. At 10 a.m., both ships return to their starting points for the first time. It is known that the time it takes for the ships to travel in the same direction is 10 minutes and the speed of the current is 0.5 meters per second. Determine the sailing speed of the Knight ship in still water.
test