Multiple Choice Questions on Two taps A and B can fill a tank in 5 hours and 20 hours respectively If both the taps are open then........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two taps A and B can fill a tank in 5 hours and 20 hours respectively If both the taps are open then...........

Quantitative Aptitude ( CCS) Pipes&cistern
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    Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank?

    4 and 1/2hrs

    Incorrect Answer

    9 hrs

    Incorrect Answer

    18 hrs

    Incorrect Answer

    36 hrs

    Correct Answer
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    Explanation:

    Part filled by (A + B) in 1 hour = 1/5 + 1/20 = 1/4

    .So, A and B together can fill the tank in 4 hours.

    Work done by the leak in 1 hour = (1/4 − 2/9)= 1/36

    Leak will empty the tank in 36 hrs.

    Hence, option 4 is the correct answer.

    By: Amit Kumar
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