Constant acceleration velocity and displacement

[libertyforall]

Homework Statement

At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.2 m/s2. At the same instant a truck, traveling with a constant speed of 8.6 m/s, overtakes and passes the automobile.
(a) How far beyond the traffic signal will the automobile overtake the truck?
m
(b) How fast will the car be traveling at that instant? m/s

The Attempt at a Solution

Not exactly sure how to go about this problem.

 

[ehild]

At the instant the traffic light turns to green, the truck and the car are at the "same spot" beside each other on the road. The truck moves at constant velocity, the car starts from rest and moves with constant acceleration. Write their displacement as function of time and find the time when the displacements are equal, and give both the displacement and the speed of the car at that instant.

ehild