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    Question

    Pipe 'A' fills half tank in 14 minutes. Pipe 'B' is 4

    times as efficient. What % of the tank will be filled by both in 4 minutes?
    A 60% Correct Answer Incorrect Answer
    B 66.67% Correct Answer Incorrect Answer
    C 71.43% Correct Answer Incorrect Answer
    D 100% Correct Answer Incorrect Answer

    Solution

    Full tank time = 14 ├Ч 2 = 28 minutes Efficiency of pipe 'A' = x units/min Tank capacity = 28x units BтАЩs efficiency = 4x units/min Work in 4 minutes = (x + 4x) ├Ч 4 = 20x units Percentage = (20x / 28x) ├Ч 100 = 71.43%

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