If a tank holds 8000 gallons of water, which drains from the bottom of the tank in 40 minutes, then the volume of water in the tank after t minutes is given by 8000 (1 A for 0 < t< 40. Which of the following is equal to rate, in %3D 40 gallons per minute, at which the water is draining from the tank after 30 minutes? 150 O 250 200 300 100

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