If a flight plan requires 2.5 hours of flying time and you must hold a 0.5 hour reserve, what percent of the total mission time is the reserve?

If a flight plan requires 2.5 hours of flying time and you must hold a 0.5 hour reserve, what percent of the total mission time is the reserve?

• A. 10%
• B. 16.7%
• C. 25%
• D. 33%

Answer: (B)

This is about finding what portion of total mission time the reserve represents. To do that, first determine the total time by adding the flight time and the reserve: 2.5 hours + 0.5 hour = 3.0 hours. The reserve is 0.5 hours out of that total, so the fraction is 0.5 / 3.0 = 1/6 ≈ 0.1667. As a percent, that is about 16.7%. So the reserve accounts for roughly one-sixth of the mission time. The other options would require different reserve amounts relative to the 3-hour total (for example, 10% would be 0.3 hours, 25% would be 0.75 hours, 33% would be 1 hour).

This is about finding what portion of total mission time the reserve represents. To do that, first determine the total time by adding the flight time and the reserve: 2.5 hours + 0.5 hour = 3.0 hours. The reserve is 0.5 hours out of that total, so the fraction is 0.5 / 3.0 = 1/6 ≈ 0.1667. As a percent, that is about 16.7%. So the reserve accounts for roughly one-sixth of the mission time. The other options would require different reserve amounts relative to the 3-hour total (for example, 10% would be 0.3 hours, 25% would be 0.75 hours, 33% would be 1 hour).