With a ground speed of 300 knots, how long will it take to descend from 21,000 feet to 11,000 feet at a rate of 2,000 feet per minute?

To determine how long it will take to descend from 21,000 feet to 11,000 feet at a rate of 2,000 feet per minute, you first need to calculate the total altitude change. The difference in altitude is 21,000 feet - 11,000 feet, which equals 10,000 feet.

Next, divide the total altitude change by the vertical descent rate. The calculation would be:

10,000 feet ÷ 2,000 feet per minute = 5 minutes.

This calculation demonstrates that at a descent rate of 2,000 feet per minute, it will indeed take 5 minutes to descend 10,000 feet. Therefore, the time required for this descent is accurately assessed as 5 minutes.