📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!
  • google app store apple app store
    • ✖

      Question

      Pipes ‘M’ and ‘N’ alone can fill a tank in 14

      minutes and 21 minutes, respectively, while pipe ‘O’ can empty the same tank in 42 minutes. If all three pipes are opened together, then find the time taken to fill the tank.
      A 4 mins Correct Answer Incorrect Answer
      B 9 mins Correct Answer Incorrect Answer
      C 12 mins Correct Answer Incorrect Answer
      D 10 mins Correct Answer Incorrect Answer

      Solution

      ATQ,
      Let the capacity of the tank be 84 litres {LCM (14, 21, and 42)}
      Efficiency of pipe ‘M’ = (84/14) = 6 litres/minute
      Efficiency of pipe ‘N’ = (84/21) = 4 litres/minute
      Efficiency of pipe ‘O’ = (84/42) = 2 litres/minute
      Required time = {84 / (6 + 4 – 2)} = 12 minutes

      Practice Next
      More Pipes and cisterns Questions

      Relevant for Exams:

      ask-question