A horizontal cylindrical tank has cross-sectional area A(x)=4(6x−x2)m2 at height x meters above the bottom when x≤3.
a. The volume V between heights a and b is ∫abA(x)dx. Find the volume at heights between 2 m and 3 m.
b. Suppose that oil is being pumped into the tank at a rate of 50 L/min. Using the chain rule, dtdx=dVdxdtdV, at how many meters per minute is the height of oil in the tank changing, expressed in terms of x, when the height is at x meters?
c. How long does it take to fill the tank to 3 m starting from a fill level of 2 m?