What headwind component was factored into the total distance required to land?

In aviation, when calculating landing distance, the headwind component is a critical factor because it affects the aircraft's speed relative to the ground. A headwind, as opposed to a tailwind, decreases the ground speed of the aircraft upon landing, which results in a shorter landing roll.

In this context, a 10-knot headwind provides a significant contribution to the total distance required to land. It means that the aircraft will touch down at a higher airspeed relative to the ground but will decelerate more quickly due to the opposing wind. This helps reduce the total distance the aircraft must cover on the runway before it can come to a complete stop.

A 5-knot headwind would also reduce landing distance, but not as effectively as a 10-knot headwind. Similarly, higher headwind components, such as 15 knots or 20 knots, while still beneficial, might not directly correlate to the specific conditions or scenarios considered in this question. However, the focus here is on finding the optimal headwind component factored into the landing distance calculation, which in this case is determined to be 10 knots. This headwind component effectively strikes a balance by being significant enough to have an impact without being overly optimistic about unrealistic