I think the easy way to do this is to break it into two parts. There might be a simpler way, but you want to understand both steps.
Acceleration
=========
a = 1.8 m/s^2
vi = 0 m/s
vf = 17 m/s
d = ????
formula
=====
vf^2 = vi^2 + 2ad
Substitute and solve
17^2 = 0^2 + 2*1.8*d
289 = 3.6 d
d = 289 / 3.6
d = 80.3 m
Deceleration
==========
vi = 17 m/s
vf = 0
a = - 1.0 m/s The vehicle is decelerating. The "acceleration" is negative.
d = ???
Note it's the same formula
0^2 = 17^2 + 2*-1*d
- 289 = - 2d
x = 144.5
Total distance = 80.3 + 144.5 = 224.8 meters.
