Elementary Geometry for College Students (6th Edition)

Given The diameter of a carousel (merry-go-round) is 30 ft. At full speed, it makes a complete revolution in 6 s. We need to find out At what rate, in feet per second, is a horse on the outer edge moving Rate = $\frac{total distance traveled in one revolution}{time taken for one revolution}$ = $\frac{Perimeter o the circular path}{time taken to cover one revolution}$ = $\frac{2\pi r}{6}$ = $\frac{\pi d}{6}$ = $\frac{\pi * 30}{6}$ = 5$\pi$ = 15.7 ft/sec