The distance between points A and B is 300mm. the radius of wheel is

Question

Two points, A and B located along the radius of a wheel, as shown in the figure below, have velocities of 80 and 140m/s, respectively. The distance between points A and B is 300mm. the radius of wheel is                                  

(a) 400 mm              (b) 500 mm             

(c) 600 mm               (d) 700 mm