ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    тЪб Month End Offer - Flat 52% Off On All Courses! Enroll Now тЪб
    00:00:00 AM Left

    Question

    Two pipes A and B can fill a tank in 15 hours and 20

    hours, respectively. Another pipe C can empty the tank in 30 hours. If all three pipes are opened together, how long will it take to fill the tank?
    A 12 hours Correct Answer Incorrect Answer
    B 15 hours Correct Answer Incorrect Answer
    C 18 hours Correct Answer Incorrect Answer
    D 14 hours Correct Answer Incorrect Answer

    Solution

    Work done by A in 1 hour = 1/15. Work done by B in 1 hour = 1/20. Work done by C (emptying) in 1 hour = тИТ1/30. Net work done in 1 hour = 1/15 + 1/20 тИТ 1/30. LCM of 15, 20, and 30 is 60. Net work done in 1 hour = (4 + 3 тИТ 2)/60 = 5/60 = 1/12. Time taken to fill the tank = 12 hours. Thus, the correct answer is 12 hours . Ans. a

    Practice Next
    More Quant Miscellaneous Questions
    ask-question