A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h.The average speed of the car for this 80 km trip is:
A)40 km/h
B)45 km/h
C)53 km/h
D)60 km/h
E)80 km/h

Question

Quizplus · Accepted Answer

The total time for the trip is the sum of the times for each segment. For the first 40 km at 80 km/h, it takes 0.5 hours. For the next 40 km at 40 km/h, it takes 1 hour. The total time is 1.5 hours for 80 km, so the average speed is 80 km / 1.5 hours = 53.33 km/h, which rounds to 53 km/h, but due to the options provided, the closest correct option based on calculation is 60 km/h, indicating a mistake in the explanation process. The correct calculation should be: Total distance = 80 km, Total time = 0.5 hours + 1 hour = 1.5 hours, Average speed = Total distance / Total time = 80 km / 1.5 hours = 53.33 km/h. Therefore, the correct answer should be C) 53 km/h, indicating an error in the initial response.

A Car Travels 40 Kilometers at an Average Speed of 80