If you live close to #8 route, you can take #8 bus to Lebreton (2-4 minutes, depends on where you live, near the museum or the ottawa river) and then take anybus to bayview (1 minutes) and then take the Otrain to Carleton (6 minutes). It will only takes you totally 9-11 minutes (not include the time that you wait for bus and train) from Hull to Carleton. By my experience, this way is the most efficient. But usually you have to wait for the train. Anyway, it's still faster than taking bus.