SOLUTION: A 12 gallon tub has a faucet that lets water in at a rate of 3 gallons per minute, and a drain that lets water out at a rate of 1.5 gallons per minute. If you start with 3 gallons

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Question 616520: A 12 gallon tub has a faucet that lets water in at a rate of 3 gallons per minute, and 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)3 min
B)4 min
C)6 min
D)7.5 min
E)8 min

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
12 gallon tub,with 3 gallons of water in the tub: needs 9Gal to fill
water in at 3 gal/min, and out at a rate of 1.5 gal/min: Net in at 1.5gal%2Fmin
9gal%2F1.5+%28gal%2Fmin%29 = 6 min