two taps can fill a tank in 6 hours and 9 hours respectivly . a third tap can emty it in 12 hours. how long will it take to fill the tank if all the taps are opened
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time of filling water is6+9=15hrs(it will fill tank 2 time in 15 hrs
empty in 12 hrs
so difference is 3 hrs
so both tap can fill in 3hrs 30 min
so after 3hr 30 min
third cap can empty approx 1/4 water which can be filled in 1hrs
so..near abt 5 hrs it will be take
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