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Adding and Subtracting Rational Expressions - Problem 9

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Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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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