Results 1 to 7 of 7

Thread: Formula 1 race..

  1. #1
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Formula 1 race..

    During a recent Formula 1 race meeting, Sterling managed to complete a lap with an average speed of 150 mph. He managed to complete the first two fifths of the lap length at a speed of 123 mph and the second two fifths of the lap length at a speed of 164 mph. At what speed was the final one fifth of the lap length covered - the answer is not 176 mph?

    ----------------------------
    suresh


  2. #2
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Re: Formula 1 race..

    James,

    i want to move this one into the sticky board..

    -----------------------
    suresh


  3. #3
    Expert Member
    Join Date
    Sep 2006
    Answers
    477

    Re: Formula 1 race..

    That's simple I guess.
    The answer is 205mph.

    The only trick here is, we can't directlly do (v1+v2+v3)/3 to get Vav.
    Simply because distance covered with velocity v3 is different than distance covered with v1 and v2. (He's covered 2/5 of the distance with v1, 2/5 of distance with v2 and 1/5 of distance with v3).

    Just use elimentery physics of v=d/t. You'll get the answer.
    (Correct me if I'm wrong)


  4. #4
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Smile Re: Formula 1 race..

    That is absolutely correct kalayama....

    Great work.....

    My solution are as follows..

    If we take the number of miles in a lap to be x miles.
    The first 2/5 are covered at 123 mph. Therefore, the time taken was (2/5) * x/123 hours.
    The next 2/5 are covered at 164 mph. Therefore, the time taken was (2/5) * x/164 hours.
    The last 1/5 is covered at y mph. Therefore, the time taken was (1/5) * x/y hours.
    The entire trip is covered at an average of 150 mph. we can conclude that:

    (2x/ 5*123) + (2x/ 5*164) + (x/ 5*y) = x / 150

    Working this out we get:

    (1/30) - (-2/123) - (-2/164) = 1/y

    The means that y = 1 / (1/30 - 2/123 - 2/164)
    Therefore y = 205 QED.

    --------------------------------------------
    suresh


  5. #5
    Expert Member
    Join Date
    Sep 2006
    Answers
    477

    Re: Formula 1 race..

    Well. I too worked it out similarly. Didn't feel like utting the entire logic up there


  6. #6
    Junior Member
    Join Date
    Dec 2006
    Answers
    4

    Re: Formula 1 race..

    Ans : 205.33mph

    Last edited by ramadidamu; 12-05-2006 at 03:50 PM.

  7. #7
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Re: Formula 1 race..

    Nice contributing ramadidamu.........

    But already our members post the answers...

    Read all the post and then reply....

    Anyway thanks for your contributing.....

    -----------------------------
    suresh


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Applying for a job can be a stressful and frustrating experience, especially for someone who has never done it before. Considering that you are competing for the position with a at least a dozen other applicants, it is imperative that you thoroughly prepare for the job interview, in order to stand a good chance of getting hired. That's where GeekInterview can help.
Interact