___
___ 速 [fast]
is in  ___
is in  ___
On-reading: ソク as in 速度 sokudo ___
SOKU (→ 束) haya(meru) 
[aj] 速い hayai fast | rapid
速める hayameru to accelerate | speed up
速さ hayasa speed  
速度 sokudo rate | velocity  
早速 sassoku immediately | at once