A friend of mine asked the following riddle. 2 mile stretch of road and you average 30MPH for the first mile, how fast do you need to travel for the 2nd mile to average 60 MPH over the entire trip. This would seem simple enough not taking into consideration time. Is it true that since the first 1 mile stretch used up 2 mins that it would be impossible to average 60 mph over the entire 2 miles??