The world’s smallest drivable unicycle is [[$ 20 $]] centimeters tall and has a tire diameter of 1.8 centimeters. It was built by the Swedish Signar Berglund, and his compatriot Peter Rosendahl has driven it several times. The longest distance that the unicycle has ever travelled is [[$ 8.5 $]] meters, which Rosendahl drove on a German television program on March 29, 1998. How many rotations did the tire complete while driving?



Answer: The tire completed about rotations during the drive.