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    JB123's Avatar
    JB123 Posts: 1, Reputation: 1
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    #1

    Sep 5, 2009, 09:30 AM
    Average Speed Problemo! Ayudame!
    The record for a marathon is 4 h, 21 min, 21 s. The marathon distance is 83.16 km. Determine the average speed in m/s of a runner achieving this record.

    I thought I got the right answer... but apparently it's wrong. I divided 83160, which is km in meters by 14421, which is the time in seconds. BUT ITS STILL WRONG.

    HELP ME! Pleaseeee:]
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
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    #2

    Sep 5, 2009, 10:03 AM

    4 hr = 240 min + 21 min = 261 min X 60 sec = 15660 sec + 21 sec = 15681 sec.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Sep 5, 2009, 10:07 AM
    You divided by the wrong number. It should be 15,681 seconds.

    There are 83,160 meters. This was ran in 15,681 seconds.



    That is a good pace. That translates to about 11.86 mph.
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