You have the answer right there in your hand, but
you're not sure of what you have yet.
If you have the speed, then ...
-- you know how far the satellite travels in 24.8 hours
and
-- you can figure out the radius of the circle that has
that distance for its circumference.
-- That radius is the distance of the satellite from the center of
the planet, when it's revolving once in 24.8 hours at that speed.
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By the way ... I wouldn't exactly call that a 'geo-synchronous' satellite,
because 'geo...' means something related to the Earth.
It would have to be a 'marso-synchronous' satellite, or whatever the
Greek word for Mars is.
