Wilma drove at an average speed of 35 mi/h from her home in City A to visit her sister in City B. She stayed in City B 15 hours, and on the trip back averaged 40 mi/h. She returned home 41 hours after leaving. How many miles is City A from City B?

Answer 1

distance between two towns --- x miles
time for first trip = x/35
time for 2nd trip = x/40

x/35 + x/40 + 15 = 41
LCD = 280
8x + 7x = 7280
x = 485 1/3 miles