con­ver­sion

con­ver­sion

km/hmin/kmmin/mimnemon­ic
512:0019:181st gear | WWI
610:00~16:0010 ×/+ 6
~9.66~6:1310:00rat
106:009:392nd gear | WWII
~10.735:359:009 + √3
125:00~8:00φ
~144:217:004+2+1 = 7
154:006:2620 — 5,K?
~16.13:436:0010 mph
~19.33:065:00length per hour
203:004:503rd gear | max
~24.142:294:00men­tal barrier