Ashley is filling a tank with water at a rate of 5 gallons per minute. The tank already had 190 gallons of water in it. Suppose the tank holds a total of 300 gallons of water. How much longer will it take her to fill the tank?
To fill the tank, Ashley needs to add 300 - 190 = <<300-190=110>>110 gallons of water.
At a rate of 5 gallons per minute, it will take her 110 / 5 = <<110/5=22>>22 minutes to fill the tank. Answer: \boxed{22}.