Question

A car travels at a speed of 60 km/h for the first 2 hours, then at 80 km/h for the next 3 hours, and finally at 100 km/h for the last 1 hour. What is the average speed of the car for the entire journey?

A 75 km/h
B 76.67 km/h
C 72 km/h
D 70.5 km/h
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