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

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Adding and Subtracting Rational Expressions - Problem 9

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

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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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