A cylindrical tank holds 20,000 gallons of water, which can be drained from the bottom of the tank in 20 minutes. The function V(t) = 20000(1 – 2 gives the volume Vof water (in gallons) in the tank at time tin minutes, where time t = 0 corresponds to the instant the tank starts to drain. 20 At time t = 3 minutes, the water is draining out of the tank at an instantaneous rate of:

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