ATC CALCULATION: Aircraft 1 (preceding) is at FL330 flying at 360 kt groundspeed. Aircraft 2 (trailing) is at FL330 flying at 420 kt groundspeed on the same route. Initial separation is 25 NM. Minimum radar separation is 5 NM. How many minutes until the 5 NM separation minimum is reached?
Answer: B — 20 minutes
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