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Puzzle ZTXP 



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???

During a recent BrainBashers race meeting, the fastest driver managed to complete a lap with an average speed of 150 mph.

They managed to complete the first two fifths of the lap at a speed of 123 mph and the second two fifths of the lap at a speed of 164 mph.

At what speed was the final one fifth of the lap length covered?

Puzzle Copyright © Kevin Stone

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Hint
The answer is not 176 mph

 

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