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    Question

    A2 type ‘P’ pipes can fill a tank in 350

    hours, while B2 type ‘Q’ pipes can fill the same tank in 504 hours. (10A × 6B) type ‘P’ pipes can fill the same tank in how many hours? (Efficiency of a type P and a type Q pipe is same)
    A 7 hrs Correct Answer Incorrect Answer
    B 6 hrs Correct Answer Incorrect Answer
    C 13 hrs Correct Answer Incorrect Answer
    D 14 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    A2 × 350 = B2 × 504 A2/B2 = 504/350 A2/B2 = 36/25 A/B = 6/5 A = 6B/5 (10A × 6B) type 'P' pipes = 10 × 6B/5 × 6B = 72B2 Required time = (B2 × 504)/(72 × B2) = 7 hrs

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