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Homework Help: Average speed

  1. Dec 4, 2007 #1
    1. The problem statement, all variables and given/known data

    a motorist travels at 30 miles at 60 miles per hr, and then 60 miles at 30 miles per hr.

    what is the average speed

    2. Relevant equations

    3. The attempt at a solution

    I have tried to set this up and i get every answer, except 36 m/hr, can you please point me the equation set up! thanks.
  2. jcsd
  3. Dec 4, 2007 #2
    nevermind, i already posted this and i saw the thread on how to do it.

    its the distance of 90, divided by .5 hrs + 2hrs which is 36 miles per hour.

    sorry for the double post.
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