The field has the shape of a rectangle, its length is 5 km find the width of the field if the length of the fence is 14 km.

The length of the fence is the perimeter of the rectangle. We can find the perimeter of a rectangle by adding its length and width and multiplying by 2, or:

2 (5 + b) = 14 km, where b is the field width.

Having simplified and solved this equation, we determine from the width of the rectangle:

10 + 2b = 14;

2b = 14-10;

2b = 4;

b = 2 km field width.

Answer: the field width is 2 km.