Multiple Choice Questions on A cistern has two pipes who can fill it in 12 and 15 minutes respectively both the pipes are o........... for CDS Exam Preparation

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Multiple Choice Questions

A cistern has two pipes who can fill it in 12 and 15 minutes respectively both the pipes are o...........

Quantitative Aptitude (CDS) Pipes&cistern
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     A cistern has two pipes who can fill it in 12 and 15 minutes respectively, both the pipes are opened together at first when the cistern is initially empty and after 3 minutes the first pipe A is turned off. What is the total time required to fill the cistern completely?

    14minutes

    Incorrect Answer

    48/5 minutes

    Incorrect Answer

    13 minutes

    Incorrect Answer

    45/4 minutes

    Correct Answer
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    Explanation:

    Let the time be x. Then,
    x/15 + (a+3)/12  = 1
    x/15 = 1-1/4
    x/15 = 3/4
    x = 45/4 
    =45/4 minutes

    By: bhavesh kumar singh
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