Question 939632
Given that the ratio of the length to the breadth is 5:4
The breadth is 70m

Let's assume that the length is 5x, so the breath is 4x
From these assumptions,
breath 4*x  = 70
Therefore x = 70/4 = 17.5

Knowing x, we can get the length which is 5*x = 5*17.5 = 87.5

Now we know length to be 87.5m, breath to be 70m,
Area of rectangle = Length * breath
 = 70m*87.5m  = 6125 m^2
Dont forget the unit.
QED