a car is travelling along a cruve having radius of curvature of 80.0 m, banked at an angle of theta=30. The coeff of static friction of ice is 0.05. What is:

a) the slowest speed the car can negotiate the banked curve with?
b) what is the fastest speed?

first of all, im having problems envisioning frictional force into the problem. would it be on the x axis or y?
also, i don't really understand what they mean of the slowest speed/ fastest speed.