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    Subject

    Quantitative Aptitude

    Topic

    Unitary Method

    Two pipes A & B can fill a tank in 15 minutes & 20 minutes respectively. Both the pipes are opened together but after 4 minutes , pipe A is turned off. What is the total time required to fill the tank

    ক)
    10 min 20 sec
    খ)
    11 min 45 sec
    গ)
    12 min 30 sec
    ঘ)
    14 min 40 sec

    Explanation

    Part filled in 4 mins = 4(1/15 + 1/20) = 7/15 Remaining part = 1 - 7/15 = 8/15 Part Filled by B in 1 min 1/20 So, 1/20 : 8/15 = 1: x x = 10 min 40 sec total time 14 min 40 sec

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