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Calculating Average Speed

  1. Sep 22, 2009 #1
    1. The problem statement, all variables and given/known data

    Calculate the average speed of a complete round trip in which the first 148.6 km is covered at 84.6 km/hr, followed by a 1.2-hour lunch and the final 148.6 km is covered at 50.6 km/hr.


    2. Relevant equations



    3. The attempt at a solution

    148.6+148.6/.569+1.2+.341 = wrong
     
  2. jcsd
  3. Sep 23, 2009 #2

    tiny-tim

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    Science Advisor
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    Hi black_hole! :smile:

    erm :redface:

    speed = distance/time, so time = distance/speed. :wink:
     
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