Hot Air Balloon
By Savitha S. & Preethi K.
The second ballon takes an extra 20 minutes to land because it started at a higher altitude than the first ballon. They both are going down at the same rate per minute. The two line are continuously decreasing. The both lines are parallel to each other.
Key: 1st: red
The third ballon landed in 26.6667 minutes, while the first balloon landed in 40 mins. The third balloon landed 13.3333 minutes before the first balloon. The slant of the third balloon is decreasing 30 feet per minute, while the first balloon took 20 feet per minute to go down. Both of the balloons altitude starts from 800 feet. The both graphs are almost the same and similar but not fully because the first balloon The two lines are parallel so they will run together and never meet.
Key: 1st balloon: red
The third ballon had to begin at 1200 feet altitude for it to land at 40 minutes.