1. Convert Units

* Circumference to meters: 240 cm = 2.4 meters

* Time to hours: 0.12 seconds = 0.12/3600 hours = 3.33 x 10^-5 hours

2. Calculate Speed

* Speed = Distance / Time

* Speed = 2.4 meters / 3.33 x 10^-5 hours

* Speed = 72,072 meters/hour

3. Convert to km/hr

* Speed = 72,072 meters/hour * (1 km / 1000 meters) = 72.072 km/hr

Therefore, the instantaneous speed of the car is approximately 72.072 km/hr.