JC Telecom

A satellite is in a circular orbit 225 km above the equator of the earth. How many kilometres must it travel for its longitude to change by 78.2°?

Assume the radius of the earth equals 6400 kilometres.

I need a cell phone that is always available. I have never owned a cell before and don’t know what to look for.
I need a phone that works coast to coast north to south, no matter where I am in the country I need to be able to pick up that cell phone and be able to communicate with customers and dispatch and they need to be able to contact me.