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Pipe A can fill a tank in 28 hours, and pipe B can fill it in 21 hours. If both pipes are opened together, how long will they take to fill the tank?

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Pipe A can fill a tank in 28 hours, and pipe B can fill it in 21 hours. If both pipes are opened together, how long will they take to fill the tank?
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This question is part of a practice set

Practice the full set: Pipes and Cisterns: Formulas, Shortcuts and Solved Examples — MCQs with Answers (Set 4) (11 MCQs) →

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