1 . A 12 gallon tub has a faucet that lets water in at a rate of 3 gallons per minute, and has a drain that lets water out at a rate of 1.5 gallons per minute. If you start with 3 gallons of water in the tub, how long will it take to fill the tub completely?
- A. 6 minutes
- B. 7 minutes
- C. 8 minutes
- D. 9 minutes
- D. None of these
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