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      Question

      Pipe A can fill a tank in 12 hours and pipe B takes 18

      hours to fill it. Both pipes were open together and a leak was spotted which increased the filling up time by 48 minutes Find how many hours it will take for the leak to empty a full tank.
      A 24min Correct Answer Incorrect Answer
      B 36min Correct Answer Incorrect Answer
      C 12min Correct Answer Incorrect Answer
      D 72min Correct Answer Incorrect Answer

      Solution

      Time of A and B for filling the tank = (12×18)/12+18 =216/30=7hours 12minute. Total time (A+B+C) 48 minute more than (A+B)- A+B+C =8 hours ABA+B+CC 12188 72 649-1 Efficiency of leak =9-(6+4) = -1 Leak will empty the whole tank =72/1 =72min 

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