Hollingworthp, did the example you use actually come in your test?
Aircraft A leaves at 10:00 travelling at 175kts, Aircraft B leaves at 10:45 from the same point travelling at 235kts, what time will the cross and how far will they have travelled.
It seems like one hell of a question to answer with something like 30seconds per question. Is there a formula which can be used? The only way I did it was using simultaneous DST formulas etc.
Cheers
Joffy
