SOLUTION: One pump takes 4 hours to fill up 20 gallons, another takes 5 hours to fill 20 gallons .If the two pumps work together, how many gallons will they fill in 8 hours?

Question 449153: One pump takes 4 hours to fill up 20 gallons, another takes 5 hours to fill 20 gallons .If the two pumps work together, how many gallons will they fill in 8 hours?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add the rates to get combined rate of filling

Multiply both sides by

The will fill 72 gallons in 8 hours working together
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