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      Question

      Tap A is 100% more efficient than tap B. Both the taps

      together can fill the tank in 6 hours. Find the time taken by tap C, which is 50% more efficient than tap B, to fill the tank alone.
      A 18 hrs Correct Answer Incorrect Answer
      B 16 hrs Correct Answer Incorrect Answer
      C 12 hrs Correct Answer Incorrect Answer
      D 15 hrs Correct Answer Incorrect Answer
      E 9 hrs Correct Answer Incorrect Answer

      Solution

      Let, time taken by tap B to fill the tank be x hours,
      So, time taken by tap A to fill the tank = x/2 hours According to question, 1/x + 1/(x/2) = 1/6
      1/x + 2/x = 1/6
      x = 18 So, time taken by tap C to fill the tank = 18/1.5 = 12 hours

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