Question

The diameter of each wheel of a bicycle is 26 inches. If you are traveling at a speed of 30 miles per hour on this​ bicycle, through how many revolutions per minute are the wheels​ turning?

Answer 1

30 ÷ 60 = .5 mile per minute

the diameter of the wheel is 26 inches

circule perimeter = 2 pi r

r = 1/2 d = 13 inch

circule perimeter = 81.7 inches

half mile = 31680 inch

31680 ÷ 81.7 = 387. 76 revolutions per minute