If you are looking for some problems with solutions you can find some by clicking on the "Practice Problems" link above.
Section 4.1 : Rates of Change
As noted in the text for this section the purpose of this section is only to remind you of certain types of applications that were discussed in the previous chapter. As such there aren’t any problems written for this section. Instead here is a list of links (note that these will only be active links in the web version and not the pdf version) to problems from the relevant sections from the previous chapter.
Each of the following sections has a selection of increasing/decreasing problems towards the bottom of the problem set.
Product & Quotient Rules
Derivatives of Trig Functions
Derivatives of Exponential and Logarithm Functions
Related Rates problems are in the Related Rates section.