Pipe A can independently empty a half-filled tank in 3 hours whereas pipe B can alone fill the same tank in 4 hours, when the tank is completely empty. In how much time will the empty tank be completely filled, if both the pipes are opened together?
Held on 23 May 2023 · Verified 13 Jul 2026.
2 hours
6 hours
7 hours
12 hours
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