If the perimeter of a rectangle field is 200 m and its breadth is 40 m. What is the area?

Perimeter of the rectangular field =2(l+b)

where l and b are the length and breadth of the rectangular field

⇒200=2(l+40)

⇒l+40=100

⇒l=60 m

Area of the rectangular fie    =60×40

                                                =2400 m2