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      Question

      A pipe can fill a tank in 36 minutes while another pipe can

      drain the full tank in 48 minutes. Calculate how much time both pipes working together will take to fill one-third of the tank.
      A 48 mins Correct Answer Incorrect Answer
      B 35 mins Correct Answer Incorrect Answer
      C 22 mins Correct Answer Incorrect Answer
      D 12 mins Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ;
      Let the total capacity of the tank be 144 litres (LCM of 36 and 48)

      Efficiency of filling pipe = (144 / 36) = 4 litres/minute

      Efficiency of draining pipe = (144 / 48) = -3 litres/minute

      Required time = (1/3 × 144) ÷ (4 - 3) = 48 minutes

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