Breakdown of hayaku
速いhayai
fast
While both 速い and 早い can mean fast, when referring purely to speed and not also implying earliness, it's more common to use 速い.
Usages of hayaku
誰 が 一番 速く 走った？dare ga itiban hayaku hasitta?
Who ran fastest?
雲 が 速く 動いて いる。kumo ga hayaku ugoite iru.
The clouds are moving fast.
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