Question

A car travels for three hours at 80km/hour. After three hours, it turns right. It drives 60km/hour for three hours. How many km has it traveled? What was the average speed of the car?
distance for first leg = 240 km
distance for 2nd leg = 180 km

Interpretation 1:

total distance traveled is the hypotenuse
d^2 = 240^2 + 180^2
etc

average speed = d/6 = ...

interpretation 2:

total distance = 240+180 = 420
total time = 6
avg speed = 420/6 = 70

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