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     EduGorilla 
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    Pipe A can fill a tank in 12 hours and pipe B can fill it in 15 hours, separately. A third pipe C can empty it in 20 hours. Initially pipe A was opened, after one hour pipe B was opened and then after 1 hour when pipe B was opened pipe C was also opened. In how many hours the tank will be full?

    Options :-

    1. 21 hours
    2. None of these
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Reply To: Pipe A can fill a tank in 12 hours and pipe B can fill it in 15 hours, separately. A third pipe C ca….
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