You are flying 150 knots groundspeed. How many miles per minute is this?

• A. 2.0 miles per minute
• B. 2.2 miles per minute
• C. 2.5 miles per minute
• D. 3.0 miles per minute

Answer: (C)

Speed in knots means nautical miles per hour. To get miles per minute, divide by 60 because there are 60 minutes in an hour.

So, 150 knots is 150 nautical miles per hour. Per minute, that’s 150 / 60 = 2.5 nautical miles per minute. In aviation contexts, the “miles” here are nautical miles, so the answer is 2.5 miles per minute.

If you needed statute miles instead, you’d multiply by about 1.15078, giving roughly 2.88 statute miles per minute, which isn’t among the options.