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A race car driver must average 220.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 218.0 km/h, what

A race car driver must average 220.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 218.0 km/h, what average speed must be maintained for the last lap?

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