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Pipe A can fill a tank in 20 hours. Pipe A and pipe B together can fill it in 4 hours. How long would pipe B alone take to fill the tank?

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Pipe A can fill a tank in 20 hours. Pipe A and pipe B together can fill it in 4 hours. How long would pipe B alone 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 1) (25 MCQs) →

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