A cylindrical tank holds 20,000 gallons of water, which can be drained from the bottom of the tank in 20 minutes. Below is a table of data giving 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. V(t) V(f) 20000 11 4050 1 18050 12 3200 2 16200 13 2450 3 14450 14 1800 4 12800 15 1250 5 11250 16 800 6 9800 17 450 7 8450 18 200 7200 19 50 9 6050 20 10 5000 The average rate of water draining from the tank is greatest during which of the following time intervals? A. From timet =7 to t= 14 B. From timet = 14 to t= 20 C. From timet = 2 to t= 4 O D. From time t = 4 to t= 5 E. From time t = 4 to t= 7

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