40, Brain weight B as a function of body weight W in fish has been modeled by the power function B 0.007W², where B and W are measured in grams. A model for body weight as a function of body length L (measured in centimeters) is W=0.12225. If, over 10 million years, the average length o a certain species of fish evolved from 15 cm to 20 cm at a constant rate, how fast was this species brain growing when the average length was 18 cm?

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