By defintion, the average speed is:
The total distance is:
The time spent for the way to work is:
The time spent for the way to home is:
Thus, the total time is:
And the average speed is:
"v = \\dfrac{86km}{\\dfrac{6063}{4898}h} \\approx 69.5\\space km\/h"
Answer. "69.5\\space km\/h".
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