a cistern can be filled by taps a and b in 10 minutes and 12 completely in 7 minutes. if all three taps are turned on the same time find the time taken to fill the cistern
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a cistern can be filled by taps a and b in 10 minutes and 12 completely in 7 minutes. if all three taps are turned on the same time find the time taken to fill the cistern
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a cistern can be filled by taps a and b in 10 minutes and 12 completely in 7 minutes. if all three taps are turned on the same time find the time taken to fill the cistern