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    Question

    Pipe A alone fill the tank in x hours and Pipe B alone

    fill the tank in (x – 7) hours. If the efficiency of pipe B is double of pipe A and pipe A fill the tank is 45 liters per hour, then what is the capacity of the tank?
    A 675 liters Correct Answer Incorrect Answer
    B 660 liters Correct Answer Incorrect Answer
    C 600 liters Correct Answer Incorrect Answer
    D 630 liters Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Pipe A alone fill 45 liters per hour, so Pipe B alone fill 90 liters per hour. Capacity of the tank = T => T/45 – T/90 = x – (x – 7) => 2T – T = 630 => T = 630 liters

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