Question

    One-sixth of a water tank is full. Pipes A and B can

    fill the tank in 6 hours and 9 hours respectively. If both the pipes are opened, how much time will it take to fill the remaining tank completely? 
    A 4 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 5 hours Correct Answer Incorrect Answer
    D 3 hours Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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