SOLUTION: It takes you 50 seconds to walk from the 1st floor to the 3rd floor. How long will it take to walk from the 1st floor to the 6th floor, if you are walking at the same speed and all

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Question 216771: It takes you 50 seconds to walk from the 1st floor to the 3rd floor. How long will it take to walk from the 1st floor to the 6th floor, if you are walking at the same speed and all floors are equivalent?
When trying to solve this, I divided the 50 seconds by the 3 floors and got 50/3. I then multiplied 50/3 by the 6 floors and got 100 seconds. This answer was incorrect, though.
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
It takes you 50 seconds to walk from the 1st floor to the 3rd floor. How long will it take to walk from the 1st floor to the 6th floor, if you are walking at the same speed and all floors are equivalent?
.
Your mistake is that there are only TWO flights of stairs between the 1st and 3rd floors.
You start at 1st floor.
You walk up one flight (2nd floor).
You walk up second flight (3rd floor).
.
50/2 = 25 seconds per flight of stairs
.
5 flights to 6th floor:
5 * 25 = 125 seconds