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     EduGorilla 
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    Pipes A, B and C can fill a cistern in 6 hr, 12 hr and 18 hr, respectively. Another pipe D can empty it in 15 hr. In which of the following cases will the tank be filled in the least time?

    Options :-

    1. If B alone is opened.
    2. If A and D are opened together.
    3. If A, B and D are opened.
    4. If B, C and D are opened.
    5. If A, C and D are opened.
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Reply To: Pipes A, B and C can fill a cistern in 6 hr, 12 hr and 18 hr, respectively. Another pipe D can empty….
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