Final answer:
The Pacific plate's speed over 1.1 million years was 5 cm/year.
Explanation:
The Pacific plate moved 5 cm/year during the last 1.1 million years between the formation of the Big Island and Maui. To calculate its speed, we divide the distance between the islands by the time difference which equals 5 cm/year.
Learn more about Tectonic Plates Movement here:
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