訓 はや(い) ・ 音 ソク
Sino-Vietnamese: tốc
辶 (movement) for meaning, 束 (bundle) for sound. Motion tied up tight and compact is motion at speed. Fast, rapid.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
新幹線はとても速いです。 (しんかんせんはとてもはやいです)
The bullet train is very fast.