Final answer:
The average speed for the entire trip is the total distance divided by the total time. The car traveled a total of 250 km over 3 hours, resulting in an average speed of 83.3 km/hr.
Step-by-step explanation:
To find the average speed for the entire trip, we need to calculate the total distance traveled and then divide it by the total time taken. The car travels 100.0 km/hr for 2 hours and then 50.0 km/hr for 1 hour. So, the distances traveled in each leg of the journey are 200 km (100.0 km/hr × 2 hr) and 50 km (50.0 km/hr × 1 hr), respectively.
The total distance traveled is 200 km + 50 km = 250 km. The total time taken is 2 hr + 1 hr = 3 hours.
Therefore, the average speed for the trip is:
Vavg = total distance / total time
Vavg = 250 km / 3 hr
Vavg = 83.3 km/hr (rounded to one decimal place)