At some point in the battle with Freezer in Dragon Ball Z, it's revealed by King Kai that Goku is using Kaioken times ten (x10) when battling Freezer. In the same battle, in the moment Freezer is beating Goku badly, Freezer confesses he's using 1/4 (25%) of his power.
The Daizenshuu 7 states that 100% of Freezer power is 120 millions, meaning 25% of his power is 30 millions. And the Dainzenshuu 7 also states Goku's base form is 3 millions, meaning kaioken times 10 (x10) gives him a power level of 30 millions. So Goku and Freezer should be relatively even because they have exactly the same power level, but Freezer is beating Goku badly, overpowering and overspeeding him.
How was Freezer at 25% of his power capable of overpowering and overspeeding Goku, when they were supposed to have the same power level?