Math

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?

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  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

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