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[" 5.Two pipes "A" and "B" can fill a ci...

[" 5.Two pipes "A" and "B" can fill a cistern in "8" and "12],[" minutes respectively.If both the pipes are opened "],[" simultaneously then after how much time "B" should "],[" be closed so that the tank is full in "6" mintues? "],[" (A) "2" mins "],[" (C) "4" mins "]

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