Working displayed in the picture below, the answer is -11 m s^-2
There is a lot of glare off of the ice, due to the sun and it also is always good to have eye protection in case you fall face first :P

v = final velocity
u = initial velocity
t = time taken
the acceleration of the cyclist is

approximately 3.33 m/s^2
the acceleration of the car is

5.0 m/s^2
