V(0) = 500,000
V(5) = 405,000
(V(5)-V(0))/(5-0) = -19,000 ft^3/min
Water is draining from a swimming pool in such a way that the remaining volume of water after t minutes is V = 200(50 - t)^2 cubic meters. Find : (a) the average rate at which the water leaves the pool in the first 5 minutes
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