Yutika Ineni and Anushya Alandur
The function for balloon number 2 is f(m)= 1200 - 20mIt takes longer when the altitude is 1200 ft, than when it is 800 ft. It takes 20 more minutes to reach the ground for 1200 ft than 800 ft. It takes 40 minutes for the first balloon to land, and it takes 60 minutes for the second to land.
This balloon takes takes a smaller amount of time than the first 2 balloons since this balloon descends 30 ft/min, but the others descend 20 ft/min. This balloon takes 26 2/3 minutes to land while the other two land at 60 & 40 minutes.
At 16 min, the 1st and 4th balloons will be at the same altitude (480 ft). That is the point where both balloon intercept (16,480).