The length of a rectangle is increasing at a rate of 5 cm/s and its width is increasing at a rate of 8 cm/s. When the length is

Question

The length of a rectangle is increasing at a rate of 5 cm/s and its width is increasing at a rate of 8 cm/s. When the length is 9 cm and the width is 7 cm, how fast is the area of the rectangle increasing (in cm²/s)?

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