Results 1 to 3 of 3

Math Help - Setting up an Average mph problem

  1. #1
    Junior Member
    Joined
    Apr 2007
    Posts
    37

    Setting up an Average mph problem

    A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the frist interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?

    My answer is 30 miles per hour. Based on common sense. Is there a formula someone can show me to set up similar type problems so I will be able to do these problems in an exam. Cheers
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by thecapaccino View Post
    A certain car increased its average speed by 5 miles per hour in each successive 5-minute interval after the frist interval. If in the first 5-minute interval its average speed was 20 miles per hour, how many miles did the car travel in the third 5-minute interval?

    My answer is 30 miles per hour. Based on common sense. Is there a formula someone can show me to set up similar type problems so I will be able to do these problems in an exam. Cheers
    The question did not ask how fast the car was going, it asked how many miles it travelled.

    In the third interval it was travelling at a speed of 30 mph as you said.
    speed = (distance travelled)/time
    => distance = speed * time
    => distance = 30mph * 5min
    => distance = 30mph * 5/60 hours
    => distance = (30 * 5/60) miles
    => distance = 5/2 miles = 2.5 miles
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2007
    Posts
    37

    Silly Mistakes

    My goodness. Reading is fundamental. Thank you....I must take care to answer the questions in future.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Setting up problem.
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: October 1st 2009, 03:58 PM
  2. Need help setting up this problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 20th 2009, 03:37 AM
  3. Need help setting up this problem....
    Posted in the Calculus Forum
    Replies: 3
    Last Post: April 4th 2008, 08:10 PM
  4. Help setting up problem.
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: January 25th 2007, 10:01 PM
  5. Help with setting up a problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 8th 2006, 11:00 AM

Search Tags


/mathhelpforum @mathhelpforum