In order for Mateen to walk a kilometer ($1000$m) in his rectangular backyard, he must walk the length $25$ times or walk its perimeter $10$ times. What is the area of Mateen's backyard in square meters?

$\text{(A)}\ 40 \qquad \text{(B)}\ 200 \qquad \text{(C)}\ 400 \qquad \text{(D)}\ 500 \qquad \text{(E)}\ 1000$
1. Let \( l \) be the length and \( w \) be the width of the rectangular backyard. According to the problem, Mateen must walk the length 25 times to cover 1000 meters. Therefore, we can write the equation:
   \[
   25l = 1000
   \]
   Solving for \( l \):
   \[
   l = \frac{1000}{25} = 40 \text{ meters}
   \]

2. Next, the problem states that Mateen must walk the perimeter 10 times to cover 1000 meters. The perimeter \( P \) of a rectangle is given by:
   \[
   P = 2(l + w)
   \]
   Therefore, we have:
   \[
   10 \times 2(l + w) = 1000
   \]
   Simplifying this equation:
   \[
   20(l + w) = 1000
   \]
   Solving for \( l + w \):
   \[
   l + w = \frac{1000}{20} = 50
   \]

3. We already know that \( l = 40 \). Substituting \( l \) into the equation \( l + w = 50 \):
   \[
   40 + w = 50
   \]
   Solving for \( w \):
   \[
   w = 50 - 40 = 10 \text{ meters}
   \]

4. The area \( A \) of the rectangle is given by:
   \[
   A = l \times w = 40 \times 10 = 400 \text{ square meters}
   \]

The final answer is \(\boxed{400}\)