<|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
 Five middle school students use a ping-pong table to practice rallying. Only two students are allowed to practice at the same time. If all five students practice for an equal amount of time within 90 minutes, calculate the practice time for each student. Express your answer in minutes as a whole number. 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
36
Five middle school students use a ping-pong table to practice rallying. Only two students are allowed to practice at the same time. If all five students practice for an equal amount of time within 90 minutes, calculate the practice time for each student. Express your answer in minutes as a whole number.
test