The length x of a rectangle is decreasing at the rate of 5 cm/minute and the width y is increasing at the rate of 4 cm/minute. When x=8 cm and y=6 cm, find the rates of change of the area of rectangle(in cm2/min).
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Solution
It is given that length (x) is decreasing at the rate of 5 cm/min
and the width (y) is increasing at the rate of 4 cm/min,