The aircrafts are flying along the small circle at 83°N. Let’s start by finding the distance they will cover:
Departure = Change in Longitude (degrees) × 60 × cos latitude
Departure = 360 × 60 × cos 83
Departure = 2632 NM
The next step is to find the time it takes to cover the distance of 2 632 NM. Since we have two aircraft we can simply add their speeds: 120 kt + 160 kt = 280 kt.
Total speed: 280 kt
Distance: 2 632 NM
2 632 NM will be covered after 9 h 24 minutes (2 632 / 280)
- If both aircraft depart at 1020 UTC they will meet again after 9 hours and 24 minutes which is at 19:44 UTC.
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