Multiple Choice Questions on A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 7 hours If bot........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 7 hours If bot...........

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    A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 7 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

    9.00hrs

    Incorrect Answer

    9.20hrs

    Incorrect Answer

    9.30hrs

    Incorrect Answer

    9.33hrs

    Correct Answer
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    Explanation:

    1/4 – 1/7 = 7 - 4/28
    Cistern filled in = 28/3
    = 9.33hrs
    Hence, option 4 is the correct answer.

    By: Amit Kumar
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