NCERT Example 4 - Application of Derivatives
Question: Length x of a rectangle decreases at 3 cm/min and width y increases at 2 cm/min. When x=10, y=6, find rates of change of perimeter and area.
Answer: Perimeter decreases at 2 cm/min; area increases at 2 cm^2/min.
Full step-by-step NCERT solution with diagrams on Something by Zero.