Charlie is riding on his unicycle. If the unicycle's wheel has a radius of 9 inches and makes 2 revolutions every 3 seconds, what is the unicycle's speed in inches per second?

-Thank you

In 3 seconds, the distance that the unicycle travels =

2 revs * distance traveled per rev =

2 * 2pi (9) = 36 pi inches

So...in 1 second it travels 1/3 of this = 36 pi / 3 = 12 pi inches / sec ≈ 37.7 inches / sec

Thank you very much kind soul!

No prob !!!