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    Question

    Pipe 'A' alone takes 30 minutes to fill half of the

    tank. Pipe 'B' is twice as efficient as pipe 'A'. Find the percentage of the tank filled by both in 10 minutes.
    A 50% Correct Answer Incorrect Answer
    B 75% Correct Answer Incorrect Answer
    C 80% Correct Answer Incorrect Answer
    D 100% Correct Answer Incorrect Answer

    Solution

    Full tank time = 30 × 2 = 60 minutes A’s efficiency = x units/min Tank capacity = 60x units B’s efficiency = 2x units/min Work in 10 minutes = (x + 2x) × 10 = 30x units Percentage = (30x / 60x) × 100 = 50%

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