Small pushboat Power - Bollard Pull

Hi Guys , I have a small pushboat with a Displacement full load 350 Kg so my question is there the possibility to push a barge with a similar displacement and dimensions with only 20 Hp ? What could be the procedure or formulas to check the towing speed ?

 

There are several methods for estimating the power needed to make advance a vessel: Morton-Getler, Guldhamer-Harvald, Holtrop-Mennen, .... Each is more or less suitable for one type of ship although, in general, they are quite good for ships with a large block coefficient, within a certain range of Froud numbers. They can give you a good enough idea of what you need.
In this forum, in the area of spreadsheets, you can obtain the method of Holtrop-Mennen.