1. Not finding help here? Sign up for a free 30min 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!

Train question

  1. Jun 26, 2008 #1
    1. The problem statement, all variables and given/known data
    What is the best way to do this problem? It looked easy but when I the solution just wasn't clicking for me. I tried to calculated the average speed of the last 20 miles explicitly and it took me a really long time and I had to crudely approximate the answer...I am pretty sure there is a simple way to do this.


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jun 26, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: Figure out the time it takes for the total trip and each segment.
     
  4. Jun 26, 2008 #3
    That's pretty much what I did. The first 30 miles take 3/4 hr and the last 20 miles take 13/36 hr. So then I just need to figure out whether 20*36/13 is greater than 45 by long division, right?
     
  5. Jun 27, 2008 #4
    That's correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Train question
  1. Train Speeds and MST3K (Replies: 3)

  2. Subset Question (Replies: 3)

  3. Probability Question (Replies: 12)

Loading...