Question

Pipes A, B, C together can fill a cistern in 12 hours. All the three pipes are opened together for 4 hours and then C is closed. A and B together take 10 hours to fill the remaining part of the cistern. C alone will fill two-thirds of the cistern in:

• A. 50 hours
• B. 48 hours
• C. 40 hours
• D. 60 hours

Answer 1

Answer: (C)