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At a groundspeed of 120 knots, how long does a 60-nautical-mile leg take?
Choices
✓ 30 minutescorrect
Time = distance / groundspeed = 60 / 120 hour = 0.5 hour = 30 minutes.
20 minutes
20 minutes would require a 180-knot groundspeed.
45 minutes
45 minutes would require an 80-knot groundspeed.
60 minutes
60 minutes would require a 60-knot groundspeed.
Why
Time equals distance divided by groundspeed: 60 NM ÷ 120 kt = 0.5 hour, or 30 minutes.
FAA source: PHAK Ch. 16 / time-speed-distance and fuelbrowse the reference library →
This is taught in Wind, Groundspeed, Time and Distance — study the lessons free, then practice with grading and mastery tracking.
Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.