Question 123510
Karen left her house heading east and 
her sister left two hours later heading west at a rate 5 mph faster than Karen. 
6 hours after Karen left she and her sister were 600 miles apart. 
How fast was Karen moving?
---------------------
Karen DATA;
Time = 6 hrs ; rate = r mph ; Distance = 6r miles 
------------------
Sister DATA:
Time = 4 hrs ;  rate = r+5 mph ; Distance = 4(r+5) = 4r+20 miles
-------------------
EQUATION:
distance + distance = 600 miles
6r + 4r+20 = 600
10r = 580
r = 58 mph (Karen's rate)
r+5 = 63 mph (sister's rate)
==============
Cheers,
Stan H.