SOLUTION: Pump A can fill an empty 10,000 gallon tank in 4 hours, and auxiliary pump B can fill the same tank in 8 hours. If there are 4,000 gallons in the tank and no liquid is removed, how

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Question 1189953: Pump A can fill an empty 10,000 gallon tank in 4 hours, and auxiliary pump B can fill the same tank in 8 hours. If there are 4,000 gallons in the tank and no liquid is removed, how long will it take the two pumps working together to fill the tank?
Answer by ikleyn(52756) About Me  (Show Source):
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Pump A can fill an empty 10,000 gallon tank in 4 hours,
and auxiliary pump B can fill the same tank in 8 hours.
If there are 4,000 gallons in the tank and no liquid is removed,
how long will it take the two pumps working together to fill the tank?
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Pump A adds  10000%2F4 = 2500 gallons of the liquid to the tank per hour.


Pump B adds  10000%2F8 = 1250 gallons of the liquid to the tank per hour.


Working together, two pumps add 2500 + 1250 = 3750 gallons of the liquid to the tank each hour.


They need add 1000-4000 = 6000 gallons of the liquid to the tank to fill it.


It will take  6000%2F3750 = 1 3%2F5  hours = 1 hour and 36 minutes.    ANSWER

Solved.