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!

Average speed of a boat

  1. Jan 31, 2009 #1
    1. The problem statement, all variables and given/known data
    A boat moves 15.0 km across a lake in 30.0 min. What was the average speed of the boat in kilometers per hour?


    2. Relevant equations
    average speed: d/t


    3. The attempt at a solution
    ok since it is asking kilometers per hour that is the part tha confuses me.
    i mean i believe that it is 15.0 km/30.0
    but it is asking for hour...
    sooo that where i get lost.
     
  2. jcsd
  3. Jan 31, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    That's what it did in 30 min.

    How much would it do in an hour.
     
  4. Jan 31, 2009 #3
    oh so then i multiply that times 2?

    or would i do 15.0/60?
     
  5. Jan 31, 2009 #4
    ok no..that doesn't make sense :S
     
  6. Jan 31, 2009 #5
    If it goes x km in thirty minutes and keeps the same speed, wouldn't it go the same distance in the next thirty minutes?
     
  7. Jan 31, 2009 #6
    ooh so then its the same..
     
  8. Jan 31, 2009 #7

    Nabeshin

    User Avatar
    Science Advisor

    Your 15km/30 is lacking one thing: Units on the 30. The 30 is in minutes, so this division would give you km/minute.
     
  9. Jan 31, 2009 #8
    hm, but it is asking for kilometers per hour.

    gosh sorry i'm soo ugh for this.
     
  10. Jan 31, 2009 #9
    30 min is ½hour, right?

    It goes 15km in ½hour - how much in 1 whole hour?
     
  11. Jan 31, 2009 #10
    oh so then it is 30km/h?
     
  12. Jan 31, 2009 #11
    Yep, that's it.
     
  13. Jan 31, 2009 #12
    wow! thank you so much!
    i truly appreciate it!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Average speed of a boat
  1. Speed boat (Replies: 1)

  2. Average speed (Replies: 1)

  3. Average speed (Replies: 2)

  4. Average speed (Replies: 15)

Loading...