Pump A can fill a tank of water in 5 hours. Pump B can fill the same tank in 8 hours. How long does it take both of the pumps working together to fill the tank? (round your answer to the nearest minute)
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1 pump A=5 hrs
pump b=8hours
1/5 x 60 minutes=12 mins
1/8 x 60 minutes=7.5 mins
12+7.5=19.5
=20 minutes
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