Answer:
Explanation:
To find the average speed of the car for the entire journey, we can use the concept of average speed formula. The average speed is calculated by dividing the total distance traveled by the total time taken.
Given:
- Distance of the first part of the journey = 19 km
- Speed of the first part of the journey = 57 km/h
- Distance of the second part of the journey = 55 km
- Speed of the second part of the journey = 110 km/h
Step 1: Calculate the time taken for each part of the journey.
Time = Distance / Speed
For the first part:
Time taken for the first part = 19 km / 57 km/h = 1/3 hours (approximately)
For the second part:
Time taken for the second part = 55 km / 110 km/h = 0.5 hours
Step 2: Calculate the total distance and total time.
Total distance = Distance of the first part + Distance of the second part = 19 km + 55 km = 74 km
Total time = Time taken for the first part + Time taken for the second part = 1/3 hours + 0.5 hours = 5/6 hours
Step 3: Calculate the average speed.
Average Speed = Total Distance / Total Time = 74 km / (5/6) hours = 88.8 km/h
The average speed of the car for the entire journey is approximately 88.8 km/h.