Revolution of moon and satellite

[Asla]

Homework Statement

What multiple of the distance between the centre of the Earth and that of the moon is the distance between the centre of the Earth and a geostationary satellite which above a fixed location on the equator?Take the cycle of revolution to the moon around the Earth to be 27 days

The Attempt at a Solution

I do not know how to start.An idea please?

 

[ehild]

Kepler's Laws?

What is the time period of a geostationary satellite?

ehild