Answer:
The rate of change of area is 35360 m /year
Step-by-step explanation:
Let the width of rectangle be w
We are given that a rectangle that is twice as long as it is wide
So, Length of Rectangle = 2w
Area of rectangle A = Length \times Breadth = 
Differentiating area with respect to time

We are given that
and w = 260

Hence the rate of change of area is 35360