Understanding 時速
The word 時速 (じそく) specifically refers to speed measured per hour, commonly used to describe how fast vehicles or objects move. It is a compound of 時 (time/hour) and 速 (speed).
Usage in Conversation
You will often hear 時速 when discussing travel times, vehicle speeds, or comparing how fast something moves. For example, "時速100キロ" means "100 kilometers per hour." This term is neutral and commonly used in both formal and informal contexts.
Common Collocations
- 時速＋数字＋キロ (e.g., 時速50キロ): Expresses speed in kilometers per hour.
- 時速を出す: To reach a certain speed.
- 時速が速い／遅い: Speed is fast/slow.
Tips for Learners
Be careful not to confuse 時速 with 速度 (そくど), which also means speed but is more general and can be used for any unit of speed, not necessarily per hour. 時速 always implies "per hour," so it is more specific and commonly used in everyday speech about travel or transport speeds.