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    srolson's Avatar
    srolson Posts: 1, Reputation: 1
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    #1

    Nov 3, 2010, 11:08 AM
    average speed
    A car travels a constant speed of 60 m/hr in a straight line, then continues in the same direction at constant speed x. The average speed for the entire trip is 30 m/hr. What is the speed of x?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 3, 2010, 12:34 PM

    The time to cover the first part is given by:



    The time to cover the second part is given by:



    The average speed is given by:



    Well, there is not enough information, or I'm too tired to see what I'm missing...
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