<|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 train overtakes two persons who are walking in the same direction in which the train is going, at a certain rate and 4 kmph, and passes them completely in 9 and 10 seconds respectively. The length of the train is 49.999999999999986 meters. What is the rate at which the train overtakes the first person? 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
24
A train overtakes two persons who are walking in the same direction in which the train is going, at a certain rate and 4 kmph, and passes them completely in 9 and 10 seconds respectively. The length of the train is 49.999999999999986 meters. What is the rate at which the train overtakes the first person?
test