Use the work formula: Combined rate = sum of individual rates. Then, Time = Total Work ÷ Combined Rate. Here, both pipes together fill the tank in ≈8.57 minutes.
Pipe "A" and "B" can fill a tank in 15 and 20 minutes respectively. How long would it take both pipes, working together to fill it?
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Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.