Length and time don't directly convert. If they did, then you'd be able
to figure out how many yards of sleep you had last night.
Miles can be related to minutes, if the speed of travel is specified.
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A 40 minute run is 40 minutes. If you are wondering how many miles that is for an average person it is between 5 and 10 miles.
None
40 mph
(10/15) x (60 minutes per hour) = 40 minutes
That means you doing a mile every 7 minutes and 40 seconds, or 7.8 miles an hour.