Given: Side of square garden = 350 m Formula Used: Perimeter of square = 4 x side Total distance covered = Number of rounds × Distance covered in 1 round Calculation: ⇒ Perimeter of garden = Perimeter of square = 4 x side ⇒4×350m=1400m ⇒ Distance covered by him in 5 rounds = Numbers of rounds × Distance covered in 1 round ⇒5×1400m=7000m 1000m=1km ⇒7000m=7km ∴ He will cover 7 km in 5 rounds of the garden. The correct option is 3 i.e. 7 km.