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OpenStudy (anonymous):
Antti entered a $10$-kilometer race. His goal is to finish in one hour. He starts off sprinting, and completes the first $2$ kilometers of the race at an average speed of $12$ kilometers per hour. To achieve his goal of a one-hour finish time, what average speed must Antti maintain for the last $8$ kilometers of the race? Enter your answer as a number in decimal form, without units.
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