QUESTION:
How fast does Mars revolve around the sun?

ANSWER from the Internet on December 17, 1996:
The answer is easily found by looking at this Web page: 
http://bang.lanl.gov/solarsys/mars.htm
There are many basic facts about Mars there.

It takes Mars 686.98 days to orbit the sun. During this time,
Mars has an average orbital velocity of 24.13 km/sec