Question 320007
Edgar averages 12 mph 
Cordelia averages 15 mph, 
total distance  is 162 miles, 
Let them meet at distance x from Edgar's starting point
Cordelia meets at a distance 162-x from her end.
The time they take to meet is same since both start at the same time.
..
time taken by Edgar = x/12
Time taken by Cordelia = 162-x/ 15
..
x/12 = 162-x / 15
15x=12(162-x)
15x= 1944-12x
15x+12x=1944
27x=1944
x= 1944/27
x=72 miles
..
distance traveled by Edgar = 72 miles
Edgar's average speed = 12 mph
time taken = 72/12
=6 hours
..
They meet at distance of 72 miles from Richmond and after 6 hours