Fast
い adjective
Just like the meaning of the kanji (fast) this adjective also means fast.
はやい
Remember how 早い means "early"? If you are early to something, it probably means you moved fast to get there. These two words share a reading (and have similar meanings, in a way, as well!).
新かん線はふつうの電車より速いです。
The shinkansen is faster than a normal train.
ポートランドから東京まで、だれが一番速く泳げるかきょうそうしました。
We had a competition to see who could swim from Portland to Tokyo the fastest.
うちの家族は、ご飯を食べるのがとても速いです。
In my family, we eat dinner really fast.