Paul lives in a 5th story apartment.  He makes 3 trips out from and back to his apartment throughout the day each day of a week.  How many feet does he travel vertically in total over the week if each story is 10 feet tall?
Since Paul makes 3 trips per day, and each trip involves going both down and up, this means he travels the full vertical distance of his apartment complex 3*2=<<3*2=6>>6 times a day.
Since there are 7 days in a week, this means he makes this trip 6*7=42 times a week.
Since each story is 10 feet tall, that means with 5 stories he travels 5*10= <<5*10=50>>50 feet each trip.
Since he made 42 trips of 50 feet each, this means he traveled 50*42= <<50*42=2100>>2100 feet in a week.
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