Speed of a Satellite at 320 kn: Calculate Time Period

[MoniMini]

Hi !
"What is the speed of a satellite which is at a height of 320 kn and has a time period of 90 minutes"

I've never come across such a question ever before.
Is there any formula to solve this problem? or do we have to use S= $d/t$
And what exactly does "time period" mean here? The time taken by the satellite to revolve around the Earth once?, or something else?

Thanks!
~MoniMini

 

[sophiecentaur]

This sounds a bit like homework but it's an easy problem as long as you remember to include the radius of the Earth when you calculate the distance the whole way round!
And, yes, that's what they mean by "time period"