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A car starts from point A and travels at a speed of 60 km/h for the first 2 hours, then increases its speed to 80 km/h for the next 3 hours. After that, it reduces its speed to 50 km/h for the next 4 hours. What is the average speed of the car for the entire trip?

A 70 km/h

B 62 km/h

C 60 km/h

D 66 km/h

E 58 km/h

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