๐Ÿ“ข Too many exams? Donโ€™t know which one suits you best? Book Your Free Expert ๐Ÿ‘‰ call Now!


    Question

    Pipe A fills a tank in 60 minutes, and pipe B can do it

    in 90 minutes. Thereโ€™s also a pipe C that drains the tank in 180 minutes. If all three pipes are opened simultaneously, how long will it take to fill the tank?
    A 25 mins Correct Answer Incorrect Answer
    B 45 mins Correct Answer Incorrect Answer
    C 30 mins Correct Answer Incorrect Answer
    D 18 mins Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total capacity of tank be 180 litres (LCM of 60, 90 and 180) Efficiency of A = 180 รท 60 = 3 litres/minute Efficiency of B = 180 รท 90 = 2 litres/minute Efficiency of C = 180 รท 180 = โ€“1 litre/minute Net efficiency = 3 + 2 โ€“ 1 = 4 litres/minute Required time = 180 รท 4 = 45 minutes

    Practice Next
    More Pipes and cisterns Questions
    ask-question

    Not sure which exam is best for you Talk to our expert

    Get My Free Call