<|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 can do a work in 60 days. He works for 15 days and later B alone completes the work in some days. Together, they complete the work in 23.999999999999996 days. In how many days can B complete the remaining work alone? 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
40
A can do a work in 60 days. He works for 15 days and later B alone completes the work in some days. Together, they complete the work in 23.999999999999996 days. In how many days can B complete the remaining work alone?
test