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      Question

      If a tank can be filled by a tap in 14 hours, but due to

      an outlet, it actually takes 7 hours longer to fill the tank, find the duration in which the outlet alone would empty the tank?
      A 35 Correct Answer Incorrect Answer
      B 28 Correct Answer Incorrect Answer
      C 30 Correct Answer Incorrect Answer
      D 42 Correct Answer Incorrect Answer

      Solution

      Let tap ‘A’ fill the tank and tap ‘B’ empty the tank. Taking LCM of 14 and 21 = 42 Efficiency of A = 3 Efficiency of (A – B) = 2 Efficiency of B = 3 – 2 = 1 Tap B will empty the tank = 42/1 = 42 So, tap B will empty the tank in 42 hours.

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