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    eria's Avatar
    eria Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 10, 2009, 05:04 AM
    Average Speed
    If a person travels 30km/h to the shops and back 20km/h what is the average speed?

    Its not 25km/h, but 24km/hour why is this:s
    HELP
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
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    #2

    Oct 10, 2009, 05:36 AM

    Well eria, the answer has to be 25 km/h unless another speed is giving or the distance in which he/she goes to the store in ratio with the distance going home is 2:3
    rehmanvohra's Avatar
    rehmanvohra Posts: 739, Reputation: 27
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    #3

    Oct 11, 2009, 07:09 AM

    Assume the distance is 30 km between A and B
    A - B = 1 hour
    B - A = 1.5 hours

    As such he took 2.5 hours to travel 60 km. The speed, therefore is 60/2.5 or 24 km per hour
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