Results 1 to 3 of 3

Math Help - speed and distance word problem

  1. #1
    Junior Member
    Joined
    Aug 2008
    Posts
    47

    speed and distance word problem

    Two planes start from the same airport and fly in opposite directions. The second plane starts one-half hour after the first plane, but its speed is 80 kilometers faster. Find the air speed of each plane if 2 hours after the first plane departs the planes are 3200 kilometers apart.

    I keep reading this problem over and over but it gets me confused everytime. I even tried drawing a diagram.
    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
    The first plane flies for 2 hrs, so its distance is 2r

    The second plane travels for 1.5 hours and 80 km faster, so it travels \frac{3}{2}(r+80) km.

    Between them they cover 3200 km

    2r+\frac{3}{2}(80+r)=3200

    Solve for r and you have the rates of the planes.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Aug 2008
    Posts
    47
    Wow.. it's not so bad o.o Thanks so much for the help!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 6
    Last Post: April 10th 2010, 04:26 AM
  2. Algebra - Speed, Distance Word Problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 9th 2010, 07:04 AM
  3. Speed Time Distance Word Problem
    Posted in the Algebra Forum
    Replies: 4
    Last Post: March 9th 2009, 06:20 PM
  4. Replies: 2
    Last Post: January 29th 2009, 03:38 AM
  5. distance-speed problem
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: May 15th 2008, 04:07 AM

Search Tags


/mathhelpforum @mathhelpforum