The wheel of a motorcycle is of radius 35 cm. How many revolutions per minute must the wheel make so as to keep a speed of 66 km/h

Radius of a motorcycle wheel is 35 cm

Then the circumference of wheel =235=222735=220 cm

The speed of the cycle is =66 Km/h=6610000060=110000 cm/min

The revolution per minute =110000220 rev/min

                                          =500  rev/min

Hence the correct option is (D). i.e 500