Time to cover 15 miles at a ground speed of 90 knots is approximately how many minutes?

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Multiple Choice

Time to cover 15 miles at a ground speed of 90 knots is approximately how many minutes?

Explanation:
Time equals distance divided by speed. With ground speed given in knots, you’re working in nautical miles per hour, so the distance should be in nautical miles. Covering 15 nautical miles at 90 knots means you travel 15 NM in 1/6 of an hour because 90 NM per hour × 1/6 hour = 15 NM. 1/6 hour is 10 minutes. A quick check: each nautical mile takes 60/90 = 2/3 of a minute, so 15 × 2/3 = 10 minutes. If the distance were treated as statute miles, the result would differ, but the standard aviation convention uses nautical miles with knots, so 10 minutes is the correct result.

Time equals distance divided by speed. With ground speed given in knots, you’re working in nautical miles per hour, so the distance should be in nautical miles. Covering 15 nautical miles at 90 knots means you travel 15 NM in 1/6 of an hour because 90 NM per hour × 1/6 hour = 15 NM. 1/6 hour is 10 minutes. A quick check: each nautical mile takes 60/90 = 2/3 of a minute, so 15 × 2/3 = 10 minutes. If the distance were treated as statute miles, the result would differ, but the standard aviation convention uses nautical miles with knots, so 10 minutes is the correct result.

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