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    deepak manchanda's Avatar
    deepak manchanda Posts: 1, Reputation: 1
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    #1

    Jun 11, 2007, 03:02 AM
    Average Speed
    A body covers half a distance with a speed of 20m/s and the other half with a speed of 30m/s.Find the average speed of the whole journey?
    colbtech's Avatar
    colbtech Posts: 748, Reputation: 66
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    #2

    Jun 11, 2007, 07:27 AM
    25m/s
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #3

    Jun 11, 2007, 09:07 AM
    Deepak, consider a test piece of road. A good length of road to choose would be one that is easily divisible by both your speeds, like 120m.

    So he travels 60m at 20m/s and 60m at 30m/s

    What is the total time he takes? What is the total distance? Therefore what's his average speed?

    Let me know if you have any trouble.
    colbtech's Avatar
    colbtech Posts: 748, Reputation: 66
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    #4

    Jun 11, 2007, 01:34 PM
    Ah thanks for the explanation, see where my "expert" guess falls down!

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