The side of a square is increasing at the rate of 0.2 cm/sec. Find the rate of increase of the perimeter of the square.

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Given: the side of a square is increasing at the rate of 0.2 cm/sec.To find rate of increase of the perimeter of the square

Let the edge of the given cube be x cm at any instant time.

Then the perimeter of the square at any time t will be P = 4x cm.