There is no single distance formula and no single velocity formula. They depend on the particular physical situation which you have neglected to share with us.
sorry A bike first accelerates from 0.0m's to 5.5m/s in 4,5s, then continures at this constant speed for another 3.0s what is the total distance traveled by the bike?
Doesn't your textbook show them and weren't they covered in class??
Starting from rest the distance traversed with constant acceleration is [itex]a t^2 /2[/itex] and the speed acquired is [itex]at[/itex]. I'll let you think about the second part! :-)