Question 706089
Allen, the situation is simpler than needing a hypotenuse.  North and South are opposite directions.  The cars travel makes no triangle.  You simply have the northbound driver having gone 65*h miles and the southbound driver having gone in the opposite direction for 60*h miles; When they are 200 miles apart, we have 
65h+60h=200
h=8/5
h=1 hour and 36 minutes.