ATPL: Longitudinal separation minima based on time for aircraft at the same cruising level when navigation aids permit frequent determination of position and speed provided that the preceding aircraft is maintaining a true air speed of 20 Kt or more faster than the succeeding aircraft will be
Question 166, Air Law - ATPL - Airline Transport Pilot license
Explanation: Longitudinal separation minima based on time for aircraft at the same cruising level when navigation aids permit frequent determination of position and speed provided that the preceding aircraft is maintaining a true air speed of 20 Kt or more faster than the succeeding aircraft will be