Explanation:

Here, D=70 cm

Which gives us circumference of the wheel as pi*D= 22/7 * 70= 220 cm=2.2 m

Speed =66 kmph= 66*(5/18) m/s

Distance travelled in 1 min= 66*(5/18)* 60 m/min= 1100 m

Now, number of revolutions = distance in one min /circumference of the wheel.

N= 1100/2.2 = 500 revolutions per minute.

Hence, option 3 is the correct answer.