Results 1 to 6 of 6

Math Help - [SOLVED] I can't get this one....

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    11

    [SOLVED] I can't get this one....

    i thought the answer to this question would be 700, but on the answer sheet it says 500. I don't get how it was done. Please help, thanks.

    If two planes leave the same airport at 1:00 PM, how many miles apart will they be at 3:00 PM if one travels directly north at 150 mph and the other travels directly west at 200 mph?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    In 2 hours, plane A travels 300 miles.

    In 2 hours, plane B travels 400 miles

    It is just a 3-4-5 triangle. Use Pythagoras.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Banned
    Joined
    May 2009
    Posts
    471
    2 hours have past, so the planes move 300 miles and 400 miles perpindicular to eachother, so how far apart they are is a pythagorean theorem question

    We have to find the hypotneuse of this triangle, so let d be how far apart they are

    d^2=300^2+400^2

    you will see d is 500
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Sep 2009
    Posts
    11
    i'm still not seeing where 500 is the answer. 25000 divided by 50 would give me 500 but where is the 50 coming from?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Sep 2009
    Posts
    11
    never mind i got it. thanks
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,690
    Thanks
    448
    Quote Originally Posted by cnotez View Post
    i'm still not seeing where 500 is the answer. 25000 divided by 50 would give me 500 but where is the 50 coming from?
    50 is not part of the problem, and there is no division involved.

    d = \sqrt{300^2 + 400^2}<br />

    calculate it.
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum