<human>:  Patricia has 4 barrels of 7 gallons each. All of them are empty, and there's only one faucet with a flow rate of 3.5 gallons per minute. How many minutes will it take to fill all 4 barrels?
<bot>: How many gallons does Patricia need? ** If Patricia has 4 barrels and each barrel has 7 gallons, then in total she needs 4*7=<<4*7=28>>28 gallons
How many minutes will it take to fill all 4 barrels? ** If the faucet can provide 3.5 gallons every minute, then she will need 28/3.5=<<28/3.5=8>>8 minutes to fill all 4 barrels
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