GLs can move faster than the speed of light also. They have to travel from their planet to recharge their rings on Oa. They can move as fast as their "WILL" will allow them. Some GLs are limited to lightspeed because they think thats the fastest anyone can possibly go.
Hal traveled to the 70th century before using his ring.
When DC and Marvel fought was one time Superman fought the Hulk. (One hit KO... lights out Hulk)
I can't find the issue number for the first time Superman and Hulk fought... but it pretty much ended in a stalemate because after days of fighting the Hulk finally calmed down when he ran out of energy and reverted back to Bruce Banner.
Learn more about GLs Cosmic... they can manipulate molecules also. Change their appearance... make inanimate objects animate. Make duplicates of themselves or others... time travel... create anything their imagination will allow them.
There is no way that Silver Surfer could fight and defeat two GLs at once. I will admit that he beat Kyle in DC vs Marvel... but that was a very inexperienced Kyle... and now look at how much Kyle has changed and he has actually mastered using his ring. Now you add Hal into that. Probably the greatest GL to ever live... has accomplished more than any other GL.