Paul is scuba diving and is 3.5 feet below sea level. He is descending at a rate of 0.5 feet per mintue. If Paul is now at 12 feet below sea level, how many mintues has he been diving?
Considering the starting point of Hector of 32.75 feet below sea level, and his pace of descending 0.5 foot each minute for the next 15 minutes, the mathematic operation would result in adding 7.5 foot, which would be totalizing in 40.25 feet