It depends on which Apache version: AH-64A=265 mph;AH-64D=295 mph
58mph
quite fast, there is more drag from the fuselage going side ways and it would be less stable
Quite a subjective question. This depends on the type of rescue helicopter, in the UK the follow are used: Westland Sea King HAR3 or HAR 5: 129 mph (112 knots, 208 km/h) (max cruise at sea level)...
The Spitfire could reach 606 mph .