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Adding and Subtracting Rational Expressions - Problem 9 540 views

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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