Question to qualify for the finals in a racing event a race, Ask an Expert

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Question: To qualify for the finals in a racing event, a race car must achieve an average speed of 255 km/h on a track with a total length of 2,400 m.

Part A: If a particular car covers the first half of the track at an average speed of 203 km/h, what minimum average speed must it have in the second half of the event in order to qualify?

I don't understand how to get the answer. Can you please help me with this question?

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