Answer :
Number of hours tap A requires to fill the tank : 6
Number of hours tap B requires to fill the tank : 8
Number of hours tap C requires to fill the tank : 12
Amount of water filled by tap A in one hour: 
Amount of water filled by tap B in one hour: 
Amount of water filled by tap C in one hour: 
Amount of water filled by taps A, B and C together in one hour: 
= 
= 
They can fill the tank together in 
hours = 
hours = 2 hours 40 min.
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