Question

The distance traveled by Earth in one orbit around the Sun is about $580,000,000$ miles. Earth makes one complete orbit around the Sun in one year. Of the following, which is closest to the average speed of Earth, in miles per hour, as it orbits the Sun?

• A. 66,000
• B. 93,000
• C. 210,000
• D. 420,000

Answer 1

The correct option is A 66,000

Distance covered by the Earth in one orbit around the sun is $580,000,000$ miles.

It does that in $1$ year, i.e. $365\times 24$ hours

The speed thus becomes distance divided by time.

$\therefore$ average speed $=\frac{580,000,000}{365\times 24}=66210.045$ hours, the closest number in the options being $66000$ hours