Question

The length of a planet's orbit around a star is approximately 18,950,000 km.

It takes the planet about 940 Earth days to complete a full orbit.
What is the planet's average speed in kmh-1 to 3sf?

Answer 1

The planet's speed is 18,950,000 km per 940 days

which equals

20,159.5744680851 kilometers per day

Dividing that by 24 gives us the planetary speed in km / hour which is

839.982269503546 kilometers per hour.

I have no idea what 3sf means so I can't answer that.

Explanation: