RPM and total velocity are fixed numbers. If you know one you know the other. they are always linearly linked in the same gear.
All you need is a larger gear linkage(where the drive shaft from the motor connects to the wheels is likely a gear, you just need either a smaller one on the engine or a larger one on the wheels whichever is easier).
RPM=speed always no amount of weight is going to change that as long as their is minimal slippage.
If you drop weight though and you add a larger final drive you could probably easily do 40. . .
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