Subject

    Quantitative Aptitude

    Topic

    Pipes & Cistern

    Three Pipes can independently fill a water tank in 10, 12 and 15 hours. How many hours will it take for all three Pipes opened together to fill half of the tank ?

    ক)
    6hr
    খ)
    5hr
    গ)
    4hr
    ঘ)
    2hr

    Explanation

    Solution: 3 Pipes in 1hr fill = 110+112+115\frac{1}{{10}} + \frac{1}{{12}} + \frac{1}{{15}}  = 6+5+460\frac{{6 + 5 + 4}}{{60}}   = 1560\frac{{15}}{{60}} = 14\frac{1}{4}part. So, Time required to fill the full tank is  = 4 hours Then half of the tank can be filled in 4 ÷ \div 2 = 2 hours

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