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Tap A can fill tank in 8 mins. Outlet B can empty the tank in 12 minutes.If both are kept open, how long will it take to fill the tank?



Tap A in 1 minute=1/8 
Tap B in 1 minute=1/12
Tap A + Tap B  = 1/8 - 1/12
Therefore  24 minutes are taken to fill the tank

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