Solve the following problem:
Problem: The tires of a car make 66 revolutions as the car reduces its speed uniformly from 86km/h to 31km/h. The tires have a diameter of 0.81m.
A- If the car continues to decelerate at this rate, how much more time is required for it to stop?
I need expert help to solve the above problem and express your answer using two significant figures.