posted by mercy .
Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per hour for the frst part of the trip and 80 kilometers per hour for the secound part. If the total trip took 6 hours, how long was she traveling at 80 kilometers per hour?
Distance for second part = x km
Distance for the first part = 440-x km
(440-x)/54 + x/80 = 6 hours.
Solve for x.