What is the correct equation for the 3:1 descent ratio?

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Multiple Choice

What is the correct equation for the 3:1 descent ratio?

Descent planning with a 3:1 ratio means you cover 3 nautical miles for every 1,000 feet of altitude you lose. To get the distance in nautical miles, you take the altitude to lose in feet, divide by 1,000 to convert to thousands of feet, and then multiply by 3. That gives distance in NM: (Altitude to lose / 1,000) × 3. For example, losing 3,000 ft requires (3000/1000) × 3 = 9 NM. This matches the expression that uses the altitude divided by 1,000 and multiplied by 3. The other forms don’t reflect the 3:1 relationship or the correct units.

Descent planning with a 3:1 ratio means you cover 3 nautical miles for every 1,000 feet of altitude you lose. To get the distance in nautical miles, you take the altitude to lose in feet, divide by 1,000 to convert to thousands of feet, and then multiply by 3. That gives distance in NM: (Altitude to lose / 1,000) × 3. For example, losing 3,000 ft requires (3000/1000) × 3 = 9 NM. This matches the expression that uses the altitude divided by 1,000 and multiplied by 3. The other forms don’t reflect the 3:1 relationship or the correct units.

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