In the Distance = Speed * Time formula, what type of airspeed is used?

In the formula Distance = Speed * Time, the airspeed used is ground speed because this measure indicates how fast the aircraft is moving over the ground. Ground speed takes into account the effects of wind, which can significantly impact the actual distance covered over time.

When pilots are calculating the distance they will travel or the time it will take to reach their destination, ground speed provides the most accurate representation of their progress in relation to the Earth's surface. This is essential for navigation and ensuring that aircraft arrive at their intended destinations on schedule.

The other airspeed measures, such as indicated airspeed, true airspeed, and calibrated airspeed, are more concerned with the aircraft's performance and behavior in the air rather than its actual movement over the ground. These measures do not factor in wind conditions, making them less relevant for calculations related to distance covered in real-time.