Multiple Choice Questions on Two taps can separately fill the tank in 18m and 12min respectively and when the waste pipe is open ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two taps can separately fill the tank in 18m and 12min respectively and when the waste pipe is open ...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    Two taps can separately fill the tank in 18m and 12min respectively and when the waste pipe is open, they can together fill the tank in 9minutes.The waste pipe can empty the tank in

    20min

    Incorrect Answer

    25min

    Incorrect Answer

    36min

    Correct Answer

    30min

    Incorrect Answer
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    Explanation:

    1/18 + 1/12 = 3+2/36 = 5/36
    5/36 – 1/9 = 5-4/36 = 1/36 => 36min

    Hence, option 3 is the correct answer.

    By: Amit Kumar
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