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Pipes and Cisterns
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SSC CGL 2025 First Shift 📅 12 Sep, 2025

Three pipes, A, B and C, are capable of filling a tank in 6, 8 and 12 hours, respectively. When all three pipes are opened together, they operate for 2 hours before pipe C is closed. How much additional time will it take to completely fill the tank after that?

A
6/7 hours
B
2/6 hours
C
3/5 hours
D
9/2 hours
Result Summary
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SSC CGL
2025 • 12 Sep, 2025 • First Shift
Three pipes, A, B and C, are capable of filling a tank in 6, 8 and 12 hours, respectively. When all three pipes are opened together, they operate for 2 hours before pipe C is closed. How much additional time will it take to completely fill the tank after that?
Correct Answer
6/7 hours
(1/6+1/8+1/12)x2 = 3/4 filled. 1/4 left. A+B rate = 7/24. Time = (1/4)/(7/24) = 6/7 hrs....
Ref/Book : 12 Sep S1 2025_3.pdf
Ref. Subject Maths
Chapter -
Ref. Topic Pipes and Cisterns
Pg. No -
💡 Analysis & Explanation
Introduction ▼
(1/6+1/8+1/12)x2 = 3/4 filled. 1/4 left. A+B rate = 7/24. Time = (1/4)/(7/24) = 6/7 hrs.
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