<|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
 Jessy plans to finish a 140-page book in a week. She initially decides to read twice daily at a speed of 10 pages an hour, spending 30 mins each time, every day of the week. By mid-week, she realizes she is behind. She decides to increase her reading speed to 15 pages per hour and add more reading time to her schedule. How many extra minutes should she read per day for the rest of the week to finish the book on time? 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
60
Jessy plans to finish a 140-page book in a week. She initially decides to read twice daily at a speed of 10 pages an hour, spending 30 mins each time, every day of the week. By mid-week, she realizes she is behind. She decides to increase her reading speed to 15 pages per hour and add more reading time to her schedule. How many extra minutes should she read per day for the rest of the week to finish the book on time?
test