How fast will a Johnson 60 hp go on a 17ft bayliner capri?

Hi i have a 15ft Shetland hobby with a 60hp engine mounted on the back. it goes about 40-45mph on flat water but on wavy days its probably about 33-38 roughly but it definitely does the job for me and my grandad to go out mackerel fishing on and jet skiing to so yous shouldn't have any problems with speed and its pretty reliable to hope this helped.

Jame aged 12