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    Question

    Pipe A can fill 50% of a tank in 4 hours and pipe B can

    completely fill the same tank in 12 hours. If both the pipes are opened at the same time, then in how much time will the empty tank be completely filled?
    A 4 hours 40 minutes Correct Answer Incorrect Answer
    B 4 hours 48 minutes Correct Answer Incorrect Answer
    C 4 hours 52 minutes Correct Answer Incorrect Answer
    D 4 hours 55 minutes Correct Answer Incorrect Answer

    Solution

    Pipe A can fill 50% of a tank in 4 hours  So, full in 8 hours Now, LCM of 12 and 8 is 24  i.e total work Efficiency of A and B = 24/8 = 3, 24/12 = 2  Effective efficiency = 5  Time = 24/5 = 4 (4/5)hours  4/5 hours = 48 minutes

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