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

A. 45

B. 36

C. 72

D. 60

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ibps rrb Save WhatsApp Report

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Answer: D. 60

Answer: (D) 60

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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