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Algebra's Related Rates examples

What are some OTHER applications of algebra's related rates problems, beyond the typical examples given as textbook exercises? The textbooks usually emphasize rate-time-distance in which an agent moves at different rates between two situations; or two agents move each at a different rate than the other; and other exercises emphasize two or more agents doing a job, each at a different rate. We can generally create a table to show expressions and variables for the agents, the rates, times, and either distances or job quantities. For the "job" type problems, general examples are people doing a job, or pipes filling or emptying a tank, or a machine/machines performing repetetive tasks.

I am interested to know what other such applications are possible which are typically not used in the algebra textbooks? Anyone know of any examples based on your experiences, or more rare textbook examples?
 Recognitions: Gold Member Science Advisor Staff Emeritus Could you give an example of what you mean by algebraic related rates problems? "Rate" is, by its nature, a calculus problem, not an algebraic problem. The basic idea is that you can take a "static" formula, on that does not depend on time, and by differentiating, convert it to a formula for rates of change.
 Yeah I've only heard of related rates in calc.