Question 904645
Q:
Wilma drove at an average speed of 40 mi/h from her home in City A to visit her sister in City B. She stayed in City B for 25 hours, and on the trip back averaged 50 mi/h. She returned home 43 hours after leaving. How many miles is City A from City B?
A:
Let x = distance from City A to City B (in miles)
distance = rate*time or
time = distance/rate
(x/40) + 25 + (x/50) = 43, multiply both sides by 200
5x + 5000 + 4x = 8600
9x = 8600-5000
9x = 3600
x = 3600/9
x = 400 miles  [Answer]