Question id 30 - Air Law - ATPL - Airline Transport Pilot license

10 NM provided that the leading aircraft maintains a true airspeed of 20 kt or more faster than the succeeding aircraft.
10 NM provided that the leading aircraft maintains a true airspeed of 10 kt or more faster than the succeeding aircraft.
20 NM provided that the leading aircraft maintains a true airspeed of 10 kt or more faster than the succeeding aircraft.
10 NM provided that the leading aircraft maintains a true airspeed of 40 kt or more faster than the succeeding aircraft.