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You travel from point A to point B in Car moving at a constant speed of 60 km/h. Then you travel the same distance to another point C moving at a...

You travel from point A to point B in Car moving at a constant speed of 60 km/h. Then you travel the same distance to another point C moving at a constant speed of 120 km/h. Your average speed for the entire trip from A to C is?

The ANSWER IS: 80 km/h but I dont know how he got that :(

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