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[" 23.Three taps "A,B" and "C" can fill ...

[" 23.Three taps "A,B" and "C" can fill a tank in "12,15" and "20" hours respectively.If A is open "n" nen "n" nen "n" nen "n" nen nen nen nen nen nen nen nen nen nen nen nen nen nen nen "],[" all the time and "B" and "C" are open for one hour each alternately,the tank will be full "],[" in : "],[[" (a) "6" hrs "," (b) "6(2)/(3)" hrs "," (c) "5," (d) "7(1)/(2)" hrs "]]

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