Pipes A and B can fill a tank in 20 minutes and 30 minutes respectively, and pipe C can empty it in 15 minutes. If all three are opened together, in how much time will the empty tank be filled?

A. 60 minutes

B. 30 minutes

C. 45 minutes

D. 12 minutes

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cpo Save WhatsApp Report

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Answer: A. 60 minutes

Answer: (A) 60 minutes

Net rate \(= \frac{1}{20} + \frac{1}{30} - \frac{1}{15} = \frac{3 + 2 - 4}{60} = \frac{1}{60}\).

Time = 60 minutes.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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