230 feet.

(1. Find the ground roll required for a 25-knot headwind at 2,200 pounds.a. Find the ground roll for 2,500 feet, 15-knot headwind at 2,200 pounds: 245 feet.b. Find the ground roll for 2,500 feet, 30-knot headwind at 2,200 pounds: 120 feet.c. The difference for a 15-knot headwind increase is 125 feet.d. Every 5-knots of headwind decreases the ground roll by 125 ÷ 3 = 41.7 feet.e. The ground roll required for a 25-knot headwind at 2,200 pounds is: 245 - (2 x 41.7) = 161.6 feet.2. Find the ground roll required for a 25-knot headwind at 2,600 pounds.a. Find the ground roll for 2,500 feet, 15-knot headwind at 2,600 pounds: 370 feet.b. Find the ground roll for 2,500 feet, 30-knot headwind at 2,600 pounds: 200 feet.c. The difference for a 15-knot headwind increase is 170 feet.d. Every 5-knots of headwind decreases the ground roll by 170 ÷ 3 = 56.7 feet.e. The ground roll required for a 25-knot headwind at 2,600 pounds is: 370 - (2 x 56.7) = 256.6 feet.3. Find the required ground roll required for 2,400 pounds.a. Ground roll for 2,200 pounds = 161.6 feet.b. Ground roll for 2,600 pounds = 256.6 feet.c. Difference = 95 feetd. The ground roll increases 95 ÷ 4 = 23.75 feet for each 100-pound increase in weight.e. The ground roll required for 2,400 pounds is:161.6 + (2 x 23.75) = 209.1 feet4. Apply correction for nonstandard temperature. The average change in temperature used by this chart is 2°C for each thousand feet.a. Standard temperature at 2,500 feet is 10°C.b. Existing temperature is 24°C.This is 24 - 10 = 14°C above standard.c. The ground roll increases 10% for each 14°C above standard temperature.d. The ground roll is 209.1 + 10% = 230.01 feet.)