**Given,**

\(\frac{dx}{dt}\) = - 5 cm/min,

\(\frac{dx}{dt}\) = 4 cm/min

Let x = length, and y = breadth

Perimeter of rectangle P = 2 (x + y)

**∴ Rate of change of P is**

**∴ Perimeter is decreasing at 2 m/s **

**If A be the area of rectangle then,**

A = x . y

**Differentiating w.r.t. 't', we get**