Subject

    Quantitative Aptitude

    Topic

    Pipes & Cistern

    A water tank is two-fifth full. Pipe A can fill the tank in 10 minutes and pipe B can empty it in 6 minutes. If both pipes are opened, how long will it take to empty or fill the tank completely ?

    ক)
    5
    খ)
    7
    গ)
    6
    ঘ)
    8

    Explanation

    Solution:      6×1010−6\frac{{6 \times 10}}{{10 - 6}} = 15 m  than  15×2515 \times \frac{2}{5} = 6 min

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