 According to MapQuest, Atlanta to Texarkana is 665.2 miles, with an  estimated travel time of 10 hours, 43 minutes (21:30 round trip).  Atlanta to Boston is 1089 miles with an estimated travel time of 17  hours, 31 minutes. If driven the whole way, it would require an  average speed of 121 miles an hour to do it in the 18 hours mandated  by the "double or nothing" but the terms of the bet didnt specify  how they were to get to Boston and certainly not how to return so  they could have driven to the airport and bought round