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Message: <blockquote data-quote="VinceM" data-source="post: 2426350" data-attributes="member: 224291">Unless you actually measure the distance, either on the map or by driving it yourself, to know the distance you've run, you need the time you ran the distance AND the rate of speed.  But you can't know the rate of your speed unless you have someone pace you in a vehicle with a spedometer.  And you can't know your time unless you know the rate of speed AND the distance.  And so on.If you KNOW any two of those factors, time, rate or distance, you can calculate the third.</blockquote>