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On vacation, Le Hong averaged 45 mph traveling from city A to city B. Returning by a different route that covered the same number of miles, he averaged 50 mph. What is the distance between the two cities if his total traveling time was 30 hours

  • math -

    if the distance is x, then since time is distance/speed,

    x/45 + x/50 = 30
    x = 710.53 miles

    check:
    710.53/45 = 15.789 A to B
    710.53/50 = 14.211 B to A
    total: 30 hours

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