The maximum speed of the driving shaft is nearly

Question

The speed of driving shaft of a Hooke’s joint of angle $19.5^{0}$(given by sin $19.5^{0}$=0.33,cos $19.5^{0}$=0.94 ) is 500 rpm. The maximum speed of the driving shaft is nearly            

(a) 168 rpm                     (b) 444rpm            

(c) 471 rpm                  (d) 531 rpm