Question

The mean (average) distance between Venus and the Sun is 6.726 X 10^7
miles
If Venus makes one complete trip around the Sun in approximately 5.393x10^3 hours (224.7 days), how fast (in miles per hour) does Venus travel around the Sun?
the radius is 6.726 x 10^7 miles
which means the circumference is 2π(6.726 x 10^7) miles
You gave the time as 5.393x10^3 hours.
Since Speed = Distance/Time
the S = 2π(6.726 x 10^7) miles/5.393x10^3 hours
= appr 7.826 x 10^4 mph

= appr 78,362 mph

The calculations above assume the orbits are circular.
Of course Kepler hundreds of years ago found that the orbits
of the planets are elliptical.

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