Question

Two hot air ballons are in flight above a field. The first balloon is 30 meters above ground and rising 25 meters per minute. The second ballon is 300 meters above ground and descending 20 meters per minute. When will the two balloons be at the same altitude? and what would be the altitude at that time?

Answer 1

after t minutes, you want

30+25t = 300-20t

Answer 2

30=25t=300-20t