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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) Γ— (8/4) = 3 hours.
      Total time = 2 + 3 = 5 hours.

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