A car travels 200 km at 80 km/h, then 90 minutes at 60 km/h. What is the total distance and the average speed for the trip?

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Multiple Choice

A car travels 200 km at 80 km/h, then 90 minutes at 60 km/h. What is the total distance and the average speed for the trip?

Explanation:
When a trip has two parts, the average speed is found by dividing the total distance by the total time. For the first leg: 200 km at 80 km/h takes 200/80 = 2.5 hours. The second leg lasts 90 minutes, which is 1.5 hours at 60 km/h, covering 60 × 1.5 = 90 km. Total distance = 200 + 90 = 290 km. Total time = 2.5 + 1.5 = 4 hours. The average speed for the whole trip is 290 / 4 = 72.5 km/h. So the trip has a total distance of 290 km and an average speed of 72.5 km/h.

When a trip has two parts, the average speed is found by dividing the total distance by the total time. For the first leg: 200 km at 80 km/h takes 200/80 = 2.5 hours. The second leg lasts 90 minutes, which is 1.5 hours at 60 km/h, covering 60 × 1.5 = 90 km. Total distance = 200 + 90 = 290 km. Total time = 2.5 + 1.5 = 4 hours. The average speed for the whole trip is 290 / 4 = 72.5 km/h. So the trip has a total distance of 290 km and an average speed of 72.5 km/h.

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