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    Question

    Pipes β€˜A’ and β€˜B’ can fill a tank in 6 hours and

    9 hours, respectively. If pipe β€˜C’ is opened along with pipes β€˜A’ and β€˜B’, then the tank gets filled in 9 hours. Find the time taken by pipe β€˜C’ to empty (3/5)th part of the same tank.
    A 2.6 hours Correct Answer Incorrect Answer
    B 1.6 hours Correct Answer Incorrect Answer
    C 3.6 hours Correct Answer Incorrect Answer
    D 4.6 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let capacity of the tank = 18 litres (lcm of 6 and 9) Efficiency of pipe β€˜A’ = (18/6) = 3 litres/hour Efficiency of pipe β€˜B’ = (18/9) = 2 litres/hour Efficiency of all the three pipes together = (18/9) = 2 litres/hour Efficiency of pipe β€˜C’ = 2 – (3 + 2) = (-3) litre/hour {Negative sign shows that pipe β€˜C’ is an outlet pipe} Required time taken = {(3/5) Γ— 18)}/3 = 3.6 hours

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