Average speed

The car drove from city A to city B at a speed of 40 km/h and back to city A at a speed of 80 km/h. What was the average speed of the car?

Correct result:

v =  53.3333 km/h

Solution:

v1=40 km/h v2=80 km/h  v=s/t v=2⋅ ss/v1+s/v2  v=21/v1+1/v2=21/40+1/80=1603=53.3333 km/h

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