New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    Pipe P can fill half of the tank in 8 hrs 5 min and pipe Q can fill the same tank completely in 16 hrs 5 min. Another pipe R can empty the full tank in 12 hrs. If all the pipes are opened together then in how much time 66.66% of the tank is filled?

    A 12 hours Correct Answer Incorrect Answer
    B 16 hours Correct Answer Incorrect Answer
    C 18 hours Correct Answer Incorrect Answer
    D 20 hours Correct Answer Incorrect Answer
    E 22 hours Correct Answer Incorrect Answer

    Solution

    Pipe A can fill half of the tank in =8 hrs 5 min Then pipe A can fill the full tank in =16 hrs 10 min So, pipe A can fill the full tank approximately in =16 hrs Pipe B can fill the same tank approximately in =16 hrs Pipe C can empty the full tank in =12 hrs One hour capacity of A = 1/16 One hour capacity of B = 1/16 One hour capacity of C = -1/12 Total capacity = 48 units (LCM of 16, 16, 12) Efficiency of pipe A = 3 units/hr Efficiency of pipe A = 3 units/hr Efficiency of pipe A = -4 units/hr = 16 hrs

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