2. Speed (Ground Speed) Calculation
Question: What is the speed (ground speed) of an airplane when it takes 1
hour and 20 minutes to fly a distance of 240 nautical miles?
Solution: Align the 24 on the outside scale with 1:20 (80) on the inside scale.
At this time, 18 is aligned with the SPEED INDEX (
▲
) on the inside
scale, and the answer is 180 Kt.
18