PISA: the Illustration Below Shows the Footprints of a Man

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PISA: The illustration below shows the footprints of a man walking.

The pace length, p , is the distance between the rear of two consecutive footprints.
For men, the formula n / p = 140 gives an approximate relationship between n and p where
n = number of steps per minute, and
p = pace length in meters
If the formula applies to Heiko's walking and Heiko takes 70 steps per minute, what is Heiko's pace length? Be sure to show your work.