A hamster runs in its wheel whose radius is 3 inches. The wheel completes 7.3 revolutions in 6 seconds.

First find the circumference    pi x d   = pi 2r  = pi *6     or   6pi inches  

6pi inches  /rev   x   7.3 rev / 6 sec  =    (6pi *7)/6  in/sec  = .......   in/s

7.3 revs  =  (7.3) *2pi (3)   =    43.8 pi    in =  distance  traveled  in 6  sec

43. 8   pi  /  6  =  7.3 pi    in  = distance traveled in one sec

Linear  velocity /  s  =    distance  traveled  in  1  sec   ≈  22.9  in   / sec