Average Speed = Total Distance &divide; Total Time.<br><br>&bull; Jogging distance = 250 m/min &times; 8 min = 2000 m<br>&bull; Total distance = 2000 m + 400 m = 2400 m<br>&bull; Total time = 15 min<br>&bull; Average speed = 2400 m &divide; 15 min = 160 m/min<br><br>Final Answer: 160 m/min