A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6 hours . How long will it take to fill the cistern if both taps are opened together
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tap 1hour work=1/4
outlet pipe 1hr. work=1/6
net part filled= 1/4-1/6=1/12
Therefore, if both taps are open then 12 hrs. is taken to fill the cistern.
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