So for all even-numbered floors (2, 4, 6, 8, 10), it takes 5*15= <<5*15=75>>75 seconds

And for all odd-numbered floors (1, 3, 5, 7, 9) it takes 5*9= <<5*9=45>>45 seconds

To climb all the floors, it takes 75+45= <<75+45=120>>120 seconds

So it takes 120/60=<<120/60=2>>2 minutes to get to the 10th floor

# Answer

2
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A building has 10 floors. It takes 15 seconds to go up the stairs to the even-numbered floors and 9 seconds to go up to the odd-numbered floors.  This includes getting to the first floor. How many minutes does it take to get to the 10th floor?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
A building has 10 floors. It takes 15 seconds to go up the stairs to the even-numbered floors and 9 seconds to go up to the odd-numbered floors.  This includes getting to the first floor. How many minutes does it take to get to the 10th floor?
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