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Homework Help: Speed, Time, Distance

  1. Oct 4, 2008 #1
    1. The problem statement, all variables and given/known data
    A person takes a trip, driving with a constant speed of 90.5 km/h except for a 22.0 min rest stop. If the person's average speed is 73.4 km/h, how much time is spent on the trip and how far does the person travel?

    2. Relevant equations
    v = d/t

    3. The attempt at a solution
    I have no idea how to solve this, other than that I have to plug the values into the average speed formula.
  2. jcsd
  3. Oct 4, 2008 #2


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    Homework Helper

    From your equation you know that d = V*t

    If you hadn't stopped you know that 90.5*t is the distance
    But you did stop 22 minutes (which is 22/60 hours) so to do the same distance it was 73.4*(t+22/60)

    Since the distance is the same then 90*t =73.4*(t+22/60)

    I'm sure you get the idea from here.
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