In one revolution, the wheel will roll once around its circumference, so one revolution equates to a distance of:
distance per revolution = 2*pi*radius = 2*(3.14159)*(0.35 m) = 2.2 m per revolution
where I converted the radius from 35 cm to 0.35 m. In 11 km = 11,000 meters, the number of revolutions is:
(11,000 m) / (2.2 m per revolution) = 5000 revolutions
