Those limits may be in your airline, but not mine. They are 30 knots dry runway (T/O and landing), 25 wet runway. There is no separate number specified for asymmetric reverse (probably because we don't do that).
Our 747 Classic FHB is similar, except 30 kt allowed for wet runway takeoff. According to our FHB, the 30 kt limits are Boeing AFM numbers, and the 25 is a local number.