What is the race named 'Monaco Grand Prix' in 2008.
select * from races where year = 2008 and name = "Monaco grand Prix"
What are the fastest lap speed in that race?
select t2.fastestlapspeed from races as t1 join results as t2 on t1.raceid = t2.raceid where t1.year = 2008 and t1.name = "Monaco grand Prix"
Show the average of them.
select avg(t2.fastestlapspeed) from races as t1 join results as t2 on t1.raceid = t2.raceid where t1.year = 2008 and t1.name = "Monaco grand Prix"