Multiple Choice Questions on One tap can fill a tank 10 hours And another tap can empty the tank in 15 hours How much time does i........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

One tap can fill a tank 10 hours And another tap can empty the tank in 15 hours How much time does i...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    One tap can fill a tank 10 hours. And another tap can empty the tank in 15 hours. How much time does it take to fill the tank if both pipes are opened ?

    20

    Incorrect Answer

    25

    Incorrect Answer

    30

    Correct Answer

    35

    Incorrect Answer
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    Explanation:

    Required time = 1/(1/10 - 1/15) hours
    = 30/(3 - 2) hours
    = 30 hours.

    By: Deepak Dawra
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