At the amusement park near the exit for the Splasher ride, they offer a dryer for people to walk in and get completely dry in only five minutes. There are three dryers. Three people just walked into the three dryers and started the machine. Nineteen other people are waiting outside the dryers. How long will the last person in the line need to wait?
Since each dryer takes five minutes to dry a person, and there are three dryers, a total of 3 * 5 = <<3*5=15>>15 minutes are needed to dry three people.
Nineteen other people are waiting, so the last person will need to wait 15 minutes + 15 minutes = <<15+15=30>>30 minutes. Answer: \boxed{30}.
To determine how long the last person in line will need to wait, we need to consider the time it takes for each person to use the dryer and the number of people ahead of them.
Given that there are three dryers and three people already inside, it means that each dryer will take approximately 5 minutes to dry one person.
Since there are 19 people waiting in line, we can divide them into groups of three (the number of dryers available). Each group of three will take 5 minutes to go through the dryers.
The last person in line will be part of the last group of three, which means they will need to wait for all the previous groups to finish before their turn.
Therefore, the last person in line will need to wait for (19 - 3) / 3 = 16 / 3 = 5.33 groups to finish before their turn.
Since each group takes 5 minutes, the last person in line will need to wait for 5.33 x 5 = 26.65 minutes.
Therefore, the last person in line will need to wait approximately 26.65 minutes.