An aircraft is seen directly ahead of you on a collision course at a range of 4 NM. Both aircraft are travelling at 120 kts. How much time do you have to prevent a collision?
When travelling at 120 kts, both aircraft are covering 2 nautical miles per minute. (Nautical miles per hour/60 minutes - 120/60 = 2)
The distance between the two aircraft is 4 nautical miles, so you will cover half that distance in one minute.
The other aircraft is travelling at the same speed and will also cover half the distance in one minute.
Your aircraft will meet in one minute.
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