Pressure altitude:   | 18,000 ft | Temperature:   | -41°C | Power:   | 2,500 RPM | MP:   | 26 | Recommended lean mixture usable fuel:   | 318 lb |
What is the approximate flight time available under the given conditions? (Allow for VFR night fuel reserve.) 2 hours 27 minutes.3 hours 42 minutes.3 hours 12 minutes. |