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Adding and Subtracting Rational Expressions - Problem 9


We use the relationship "distance equals rate times time" to work with word problems involving rates, traveling, time, and commonly, word problems about airplanes or boats traveling against and with a current. If you're asked "how long," one strategy is to solve for time, and write a sum of the time upstream with the time downstream. From there, if you know the boat's speed in still water, you can solve for the total time for the journey.

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