First step is to find the circumference of the wheel (pi x diameter) The radius is half of the diameter so 2 x 30 = 60 60 x pi (3.14) = 188.4 centimeters or 1.884 meters
Changing the kilometers into meters, and diving by 3 (to reduce the 3 hours into meter per hour) you'd get the total distance covered is 36,000 meters which equates to 12,000/hour or 200 meters/minute or 3.33 meters/second.
You take 3.33 and divide it by 1.884 which will give you 1.7675 Now you multiply it by the number of degrees of the wheel (which of course is 360) so 1.7675 x 360 = 636.3
Hi, this question is a little unclear. If you want to know what percentage he saved, it would be 30%, and to convert that percentage into a decimal would be a decimal of 0.30
