Multiple Choice Questions on Two pipes A and B would fill a cistern in 20m and 30min respectively both pipes are kept open for 10........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two pipes A and B would fill a cistern in 20m and 30min respectively both pipes are kept open for 10...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    Two pipes A and B would fill a cistern in 20m and 30min respectively, both pipes are kept open for 10min and the first pipe be turned off after that the cistern may be filled in ?

    6min

    Incorrect Answer

    5min

    Correct Answer

    8min

    Incorrect Answer

    10min

    Incorrect Answer
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    Explanation:

    Answer & Explanation

    Answer – 5min
    Explanation :
    10(1/20+1/30) = 10[3+2/60] = 50/60 = 5/6
    Remaining part = 1-5/6 = 6-5/6 = 1/6
    Second pipe = 30*1/6 = 5min

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