Question 334504
Traveling a 60 mile trip. Averaged 30 mph for the first 30 miles. What would be the average mph on the balance of the trip so that the total average is 60 mph? 
<pre><b>
To average 60 mph on a 60 mile trip, you must arrive 1 hour after you start.
But if you have traveled the first 30 miles at only 30 mph, you will have used
up the whole hour just to go half-way.  So there is no way you can average 60
mph even if you could travel the balance of the trip at the speed of light! 

Edwin</pre>