Write a real world problem involving a proportional relationship. Explain how you know the relationship is proportional.

The number of floors on a skyscraper and the time it takes to get to the higher floors by the elevator.

The relationship is proportional because the higher the elevator goes up, the longer it will take to get there. For example:

Floor 1 takes 25 seconds

Floor 2 takes 50 seconds

Floor 3 takes 1 minute 15 seconds

Floor 4 takes 1 minute 40 seconds

and so on.