In 2002, Martin Buser, from Big Lake, Alaska, won Iditarod in time of 8 days , 22 hours, 46 minutes, and 2 seconds setting the new record. In 2006, Jeff King, from Denali, Alaska, won Iditarod in the time of 9 days, 11 hours, 11 minutes, and 36 seconds. Suppose length of race is 1112 miles. Find positive difference between the mean speeds in miles per hour?