Rovers suffered back-to-back defeats by Catalan Dragons and Wakefield in their opening two matches but were too good for last season's wooden spoonists Widnes.
Eight different players contributed tries for Hull, with captain Michael Dobson opening the scoring in the eighth minute while he also added six goals. Omari Caro, Dale Ferguson, Kris Welham, Graeme Horne, Greg Eden, Chris Heil and Craig Hall also touched down.
Rovers had the match all but wrapped up by half-time after establishing a 34-0 lead, before Widnes added some respectability with second-half scores from Gareth Hock, Rhys Hanbury and Alex Gerrard.
- Sports & Recreation
- Catalan Dragons
- Kris Welham
- Dale Ferguson