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     EduGorilla 
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    A pipe can empty a tank in 40 min. B pipe with diameter twice much as that of the A is also attached with the tank to empty it. The two together A and B can empty the tank in:

    Options :-

    1. 8 min
    2. 13min
    3. 30 min
    4. 38 min
    5. None of these
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