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    Question

    A single tap takes 8 hours to fill the entire tank.

    Initially, only one tap is open, and it fills one-fourth of the tank. At that point, three additional identical taps are turned on. How much total time is required to completely fill the tank?
    A 2 hrs Correct Answer Incorrect Answer
    B 5 hrs Correct Answer Incorrect Answer
    C 8 hrs Correct Answer Incorrect Answer
    D 10 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,
    The first tap alone fills one-fourth of the tank in 8/4 = 2 hours.
    With 4 taps running, the remaining three-fourths is filled in (3/4) × (8/4) = 3 hours.
    Total time = 2 + 3 = 5 hours.

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