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Thread: what is the average speed ?

  1. #1
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    what is the average speed ?

    A plane maintains an average speed of 285mph from London to New York. It then returns from New York to London at an average speed of 76mph. What is the average speed for the entire journey?

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


  2. #2
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    Re: what is the average speed ?

    120 is the answer?

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    Brijesh Jain
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  3. #3
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    Re: what is the average speed ?

    Yes jainbrijesh.....Plz leave your solution...

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


  4. #4
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    Re: what is the average speed ?

    let distance=d,
    av.speed1=v1=285
    time=t1,
    d=285*t1

    here again distance=d
    av. speed2=v2=76
    time=t2
    d=76*t2

    now: 285*t1=76*t2
    t2=(285/76)*t1

    Now av. speed=2d/(t1+t2)

    solve it and get the answer 120.

    Last edited by jainbrijesh; 01-04-2007 at 01:49 AM.
    Regards,
    Brijesh Jain
    ---------------------------------------------------------
    Connect with me on Skype: jainbrijesh
    Google Plus : jainbrijeshji

  5. #5
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    Re: what is the average speed ?

    Very Good Explanation buddy.....

    Keep it up.....

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


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