Kevin works at an Internet café. The café charges customers based on the amount of time they use the Internet. There is a flat fee of $3 for all users. In addition, users are charged 20 cents for each 10-minute period they use the Internet. 3. Which of these two statements makes more sense?
a. The amount of money charged depends on the amount of time spent on the Internet.
b. The amount of time spent on the Internet depends on the amount of money charged.

A customer at the café is charged $4.60 for her time on the Internet. How many hours was she on the Internet? Show your work.