Superman cant instantly travel at the speed to pass through time he has to work up to that speed.
Actualy we can safley say goku is faster then the speed of light. If radditz can dodge at the speed of light at only 1/1,000,000 of gokus power its safe to say hes beyond speed of light.
Other wise they wouldnt have found anyone moving faster then radditz.
If goku existed in supermans world he'd easly pass through time,but he dont need to couse he has the dragonballs.
If the fights they had in DBZ existed in supermans world theyd never touch each other couse they'd constantly be traveling through time.
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