Given,
Length of the park = 45 m
Breadth of the park = 35 m
Park is in the shape of a rectangle.
We know that perimeter of a rectangle = length + breadth + length + breadth
Perimeter of the park
= (45 + 35 + 45 + 35) m
= 160 m
Distance covered by the Alex in taking 5 rounds of the park
= 5 × perimeter of the park
= 5 × 160
= 800 m