8.1.5 Solving Rational Equations and Inequalities (continued) Example 3 Problem Solving Application The relationship between distance d , average speed r , and time t , t = d / r , can be used to write a rational equation. Note that if c is the average speed of current, then the average speed traveling downstream (with the current) is equal to the average speed in still water plus c . And the average speed traveling upstream (against the current) is equal to the average speed in still water minus c .
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