1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Average speed, and total distance traveled

  1. Sep 8, 2009 #1
    1. The problem statement, all variables and given/known data
    Sally travels by care from on city to another. She drives for 30.0 min at 80.0 km/h, 12.0 min at 105 km/h, and 45.0 min at 40. km/h, and she spends 15.0 min eating lunch and buying gas.
    a.) Determine the average speed for the trip.
    b.) Determine the total disance traveled.

    2. Relevant equations

    Vavg= total distance/time
    Vavg=change in displacement/time

    3. The attempt at a solution
    a.) is 53.5, and b.) is 91 but im not sure how to get them.
    My friend was trying to explain it to me, and said to turn all the minutes into hours and multiple them by the speeds. I did that and got 91, but im not sure why i had to do that.
     
  2. jcsd
  3. Sep 8, 2009 #2
    what are the units of 53.5? Give units in your answers.
     
  4. Sep 8, 2009 #3
    a.) is km/h and b.) is km, i figured it out though.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Average speed, and total distance traveled
Loading...