Practice problem

Intro to Adding and Subtracting Rational Expressions

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Contributors

Taylor Evans
Joshua Siktar

Filling out study guides to prepare for an exam — Image via pexels (Creative Commons CC0 for Commercial Reuse)

Kerry and Tess are completing study guides for an upcoming math exam. It would take Kerry $20$ hours to complete the study guide. It would take Justin $15$ hours to complete the study guide. How long would it take if they worked together?