Let's show the combat speed for both characters with the fights of PC Superman Vs Mongul Sr and Kid Goku Vs Kuririn:
Superman Vs Mongul:
Superman fight at human speeds against the slow brick called Mongul Sr and get rekt everytime, incapable to avoid or block a single attack despite Mongul being slower in combat than Batman...
http://image.noelshack.com/fichiers/2016/45/1478733345-p00008.jpg
http://image.noelshack.com/fichiers/2016/45/1478733361-p00009.jpg
http://image.noelshack.com/fichiers/2016/45/1478733351-p00010.jpg
http://image.noelshack.com/fichiers/2016/45/1478733359-p00011.jpg
http://image.noelshack.com/fichiers/2016/45/1478733365-p00012.jpg
That's how fast slowperman is in combat... Like any human beings...
Now let's see Kid Goku Vs Kuririn whom fight at superhuman speeds to the point they are invisible to the bystanders and exchange multiples blows at super-speed with incredible skills in every panels...
Kid Goku Vs Kuririn:
http://image.noelshack.com/fichiers/2016/45/1478733112-dragon-ball-v11-099.jpg
http://image.noelshack.com/fichiers/2016/45/1478733133-dragon-ball-v11-100.jpg
http://image.noelshack.com/fichiers/2016/45/1478733118-dragon-ball-v11-101.jpg
http://image.noelshack.com/fichiers/2016/45/1478733125-dragon-ball-v11-102.jpg
http://image.noelshack.com/fichiers/2016/45/1478733134-dragon-ball-v11-103.jpg
http://image.noelshack.com/fichiers/2016/45/1478733129-dragon-ball-v11-105.jpg
Considering Kid Goku superior skills, combat speed and his striking power being enough to hurt Superman that means that Kid Goku can beat him very easily.
Considering Kid Goku's Kamehameha power output being superior to Master Roshi's (able to one-shot the Moon) and Superman weakness and vulnerability to Ki-attacks that means that Kid Goku can one-shot Superman with a single kamehameha.
Kid Goku destroys Superman effortlessly so everything after that Son Goku will totally slaugthers Superman effortlessly.