Speed; how fast something moves or happens — the rate of motion or quickness (esp. written with 速さ).
自転車の速さを時計で測った。
I measured the bicycle's speed with a stopwatch.
速さを競うレースで彼は1位になった。
He took first place in the speed race.
反応の速さが仕事の能率に影響する。
The quickness of responses affects work efficiency.
Earliness; the quality of being early in time (esp. written with 早さ).
会議の早さを評価するなら、準備の速さも重要だ。
If you're judging how quickly a meeting runs, the speed of preparation is also important.
早さを重視して、予定より早く出発した。
Putting value on earliness, we left earlier than planned.