The longitudinal separation minimum based on time between aircrafts at the same FL, where there is enough coverage for navigation aids and the preceeding aircraft has a higher true airspeed of 20kts minimum is:
a. 3 minutes
b. 15 minutes
c. 5 minutes
d. 10 minutes
a. 3 minutes
b. 15 minutes
c. 5 minutes
d. 10 minutes