Question 987261
You drive for 1 mile at a constant velocity of 30 mph.
 You then want to instantly speed up and drive another mile so that your average velocity for the 2 miles is 60 mph.
 What velocity must you drive for the second mile?
:
An impossible situation, you have already used up the allotted time, covering the first mile, the time required to travel two miles at an average of 60 mph.