Find the total distance jogged, then divide by the speed to get the time taken.<br><br>
&bull; Perimeter of square field = 4 &times; 100 m = 400 m<br>
&bull; Distance for 3 rounds = 3 &times; 400 m = 1200 m<br>
&bull; Time taken = 1200 &divide; 80 = 15 minutes<br><br>
Final Answer: 15