Water is building up in a bathtub. After 2 minutes there are 12 gallons of water and after 4 minutes, there are 20 gallons of water. What is the average rate at which water is entering the bathtub from #t=2# to #t=4# minutes?

1 Answer
Mar 29, 2018

Average rate at which water is entering the bathtub is #4# gallons per minute.

Explanation:

After #2# minutes there are #12# gallons of water and

after #4# minutes, there are #2#0 gallons of water.

Hence between #2# and #4# minutes i.e. in #2# minutes, #20-12=8# gallons of water has entered the bath tub.

Hence, average rate at which water is entering the bathtub from #t=2# to #t=4# minutes is #8/2=4# gallons per minute.