In 20 mins the car travels 66/3 km=22km=22000m=2200000cm. If 40cm is the radius of each wheel then the circumference of one wheel is 80(pi). The number of revolutions is 2200000/80(pi)=8753.52, or approx 8,754 for each wheel. If the wheel diameter is 40cm, then the number of revolutions is 17,507.