math

A girl starts to walk to her school, which is 20 miles away, at 6:50 and at a rate of 3 miles per hour. After a while, her dad picks her up and drives her through the remainder of the way at 30 miles per hour. If they arrived at school at 9:00, how far did she walk?

asked by sam
  1. Let n be the distance she walks, and 20-n be the distance she rides. Then:
    n/3+(20-n)/30=13/6
    10n+20-n=65
    9n=45
    n=5
    She walked 5 miles; and rode for 15
    ☺☺☺☺

    posted by unowen

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