Final answer:
The car would have traveled a total distance of 1500 cm.
Step-by-step explanation:
To find the distance the car traveled, we need to calculate the distance traveled at high speed and the distance traveled at low speed, and then add them together.
Distance traveled at high speed = Speed x Time = 30 cm/sec x 30 sec = 900 cm
Distance traveled at low speed = Speed x Time = 20 cm/sec x 30 sec = 600 cm
Total distance traveled = Distance at high speed + Distance at low speed = 900 cm + 600 cm = 1500 cm