# Average speed

What is the average speed you have to move the way around the world in 80 days? (Path along the equator, round to km/h).

Correct result:

v =  21 km/h

#### Solution:

$t=80 \cdot \ 24=1920 \ \\ r=6371 \ \\ s=2 \pi \cdot \ r=2 \cdot \ 3.1416 \cdot \ 6371 \doteq 40030.1736 \ \\ v=s/t=40030.1736/1920=21 \ \text{km/h}$

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