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To qualify for the finals in a racing event, a race car must achieve an average...

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 1,700 m. If a particular car covers the first half of the track at an average speed of 220 km/h, what minimum average speed must it have in the second half of the event in order to qualify?

_____km/h

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