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A woman drove to work at an average speed of 40 miles per hour and returned along the same route at 30 miles per hour. If her total traveling time was 1 hour, what was the total number of miles in the round trip?

  • math -

    Her average speed was 35 miles per hour. Since the round trip took her 1 hour, what was the total number of miles in the round trip?

    If you post your answer, we'll be glad to check it.

  • math -

    went t hours at 40
    went (1-t) at 30
    so
    40 t = 30 (1-t)
    70 t = 30
    t = 3/7 of an hour
    distance at 40 = (3/7)(40) = 120/7
    distance at 30 = (4/7)(30) = 120/7 better be the same:) check
    so total distance = 240/7

  • math -

    I forgot to mention that this is an SAT question of the Day and they give you options for answers. The options are:
    30
    30 1/7
    34 2/7
    35
    40
    Sorry if the way I put it was confusing.

  • math -

    240/7 = 34 2/7
    not allowed to use average because distance, not time, is the same

  • math -

    I did not see that SAT question of the day. I usually do them.

  • math -

    Oh, this question is from a while ago. They are very helpful in preparing for the SAT. Thank you for your help.

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