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    Subject

    Quantitative Aptitude

    Topic

    Unitary Method

    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 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 ?

    ক)
    4.5hrs
    খ)
    7hrs
    গ)
    18hrs
    ঘ)
    36hrs

    Explanation

    Let the speed of car be x kmph. Therefore, the speed of train = 1.5x kmph Distance traveled by train and car is same. Time difference is 12.5 minutes. (75/x) - (75/1.5x) = (125/10x60) x = 120

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