A rectangular jogging track is of length 60 m and breadth 40 m. How much time will a man take to cover three rounds of the track, jogging at the uniform speed of 80 m/min?

Length of the track = 60 m

Breadth of the track = 40 m

Distance covered by man in 1 round of the jogging track is equal to the perimeter of the rectangle.

Perimeter of a rectangle is given by, 2 × (length + breadth).

∴  Distance covered by man in 1 round = 2 × (60 m + 40 m) = 200 m

∴  Distance covered by man in 3 rounds = 3 × 200 m = 600 m

Speed = 80 m/min

∴ Time taken to cover 3 rounds of track $=\frac{\mathrm{Distance}}{speed}=\frac{600}{80}=7.5 \min$