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Add all the speed readings you have, e.g. from every second over a minute. Then you divide the answer by the number of readings you have.
About 365.5 meters a minute.
Divide Distance by Time to calculate Speed. 15 / 70 = .2142857 miles per minute or an average of 1/5 to 1/4 mile per minute.
s=m/t s=1/0.5: 2m/s
None of the units make sense here, please recheck units and ask again