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?
How many seconds does it take to go up to the even-numbered floors? ** So for all even-numbered floors (2, 4, 6, 8, 10), it takes 5*15= <<5*15=75>>75 seconds
How many seconds does it take to go up to the odd-numbered floors? ** And for all odd-numbered floors (1, 3, 5, 7, 9) it takes 5*9= <<5*9=45>>45 seconds
How many seconds does it take to climb all the floors? ** To climb all the floors, it takes 75+45= <<75+45=120>>120 seconds
How many minutes does it take to get to the 10y floor? ** So it takes 120/60=<<120/60=2>>2 minutes to get to the 10th floor
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