The Sears Tower in Chicago is 443 m tall. Joe wants to set the world's stair climbing record and runs all the way to the roof of the tower. If Joe's average speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower?

*This is about average velocity and displacement.

738.3 seconds (12.3 minutes)

If we assume that Joe's speed is 0.6 m/s in the vertical direction, then the total displacement he must cover is 443 meters in the vertical direction. Now, the formula for average speed is:

average speed = total distance / total time

total time = total distance / average speed

total time = 443/0.6

total time = 738.3 seconds