What is the approximate acres-per-minute for a sprayer with a 40-foot swath traveling at 120 feet per minute?

• A. 0.10 ac/min
• B. 0.11 ac/min
• C. 0.15 ac/min
• D. 0.20 ac/min

Answer: (B)

Acres per minute is found by multiplying the sprayer’s swath width by its ground speed to get square feet sprayed each minute, then converting to acres. A 40-foot swath sprayed at 120 feet per minute covers 40 × 120 = 4,800 square feet per minute. Since 1 acre = 43,560 square feet, 4,800 ÷ 43,560 ≈ 0.110 acres per minute. So the approximate rate is 0.11 ac/min. The other values would require different speeds (for example, 0.10 ac/min corresponds to about 4,356 sq ft per minute, implying a slower speed; 0.15 or 0.20 ac/min would need much higher speeds).